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Superconducting joints using reacted multifilament MgB_(2)wires:A technology toward cryogen-free MRI magnets

Journal of Magnesium and Alloys 2024年第1期12卷 159-170页

作者： Dipak Patel Akiyoshi Matsumoto Hiroaki Kumakura Yuka Hara Toru Hara Minoru Maeda Hao Liang Yusuke yamauchi Seyong Choi Jung Ho Kim Md Shahriar A.Hossain School of Mechanical and Mining Engineering The University of QueenslandSt LuciaQueensland 4072Australia National Institute for Materials Science(NIMS) 1-2-1 SengenTsukubaIbaraki 305-0047Japan Department of Electrical Engineering and Kangwon High Magnetic Field Center Institute of Quantum Convergence TechnologyKangwon National UniversityGangwon 24341Republic of Korea Australian Institute for Bioengineering and Nanotechnology(AIBN) The University of QueenslandSt LuciaQueensland 4072Australia Department of Materials Process Engineering Graduate School of EngineeringNagoya UniversityNagoyaAichi 464-8603Japan Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of WollongongNorth WollongongNew South Wales 2500Australia

The development of superconducting joining technology for reacted magnesium diboride(MgB_(2))conductors remains a critical challenge for the advancement of cryogen-free MgB_(2)-based magnets for magnetic resonance imaging(MRI).Herein,the fabrication of superconducting joints using reacted carbon-doped multifilament MgB_(2)wires for MRI magnets is *** achieve successful superconducting joints,the powder-in-mold method was employed,which involved tuning the filament protection mechanism,the powder compaction pressure,and the heat treatment *** fabricated joints demonstrated clear superconducting-to-normal transitions in self-field,with effective magnetic field screening up to 0.5 T at 20 *** evaluate the interface between one of the MgB_(2)filaments and the MgB_(2)bulk within the joint,serial sectioning was conducted for the first time in this type of superconducting *** serial sectioning revealed space formation at the interface,potentially caused by the volume shrinkage associated with the MgB_(2)formation or the combined effect of the volume shrinkage and the different thermal expansion coefficients of the MgB_(2)bulk,the filament,the mold,and the sealing *** findings are expected to be pivotal in developing MgB_(2)superconducting joining technology for MRI magnet applications through interface engineering.

关键词： Mg B2 superconducting joint MgB_(2)conductor MRI applications Cryogen-free magnet Persistent-mode operation

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Endocytoscopic narrow-band imaging efficiency for evaluation of inflammatory activity in ulcerative colitis

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World Journal of Gastroenterology 2015年第7期21卷 2108-2115页

作者： Yasuharu Maeda Kazuo Ohtsuka Shin-ei Kudo Kunihiko Wakamura Yuichi Mori Noriyuki Ogata Yoshiki Wada Masashi Misawa akihiro yamauchi Seiko Hayashi Toyoki Kudo Takemasa Hayashi Hideyuki Miyachi Fuyuhiko Yamamura Fumio Ishida Haruhiro Inoue Shigeharu Hamatani Digestive Disease Center Showa University Northern Yokohama Hospital Department of Gastroenterology and Hepatology Tokyo Medical and Dental University Hospital Endoscopy Center Showa Hospital Department of Pathology Showa University Northern Yokohama Hospital

AIM:To assess the efficacy of endocytoscopic narrowband imaging(EC-NBI)for evaluating the severity of inflammation in ulcerative colitis(UC).METHODS:This retrospective study was conducted at a single tertiary care referral *** included UC patients who underwent colonoscopy with endocytoscopy from July 2010 to December *** was performed,and the images were evaluated by assessing visibility,increased vascularization,and the increased calibers of capillaries and were classified as Obscure,Visible or *** was indicative of inactive disease,while Visible and Dilated were indicative of acute *** study received Institutional Review Board *** primary outcome measures included the diagnostic ability of EC-NBI to distinguish between active and inactive UC on the basis of histological *** conventional endoscopic images were classified according to the Mayo endoscopic score.A score of 0 or 1 indicated inactive disease,whereas a score of 2 indicated active ***:Fifty-two patients were *** was a strong correlation between the EC-NBI findings and the histological assessment(r=0.871,P<0.01).The sensitivity,specificity,positive predictive value,negative predictive value,and accuracy of EC-NBI for diagnosing acute inflammation were 84.0%,100%,87.1%,100%,and 92.3%,respectively,while those for the Mayo endoscopic score were 100%,40.7%,100%,61.0%,and 69.2%,*** with conventional endoscopy,EC-NBI was superior in diagnostic specificity,negative predictive value,and accuracy(P<0.001,P=0.001 and P=0.047,respectively).CONCLUSION:The EC-NBI finding of capillaries in the rectal mucosa was strongly correlated with histological inflammation and aided in the differential diagnosis between active and inactive UC.

关键词： Endosytoscopy Narrow-band imaging Magnified endosc

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Bin-scanning:Segmentation of X-ray CT volume of binned parts using Morse skeleton graph of distance transform

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Computational Visual Media 2023年第2期9卷 319-333页

作者： Yuta yamauchi Tatsuya Yatagawa Yutaka Ohtake Hiromasa Suzuki School of Engineering The University of Tokyo7–3–1HongoBunkyo-kuTokyoJapan

X-ray CT scanners,due to the transmissive nature of X-rays,have enabled the non-destructive evaluation of industrial products,even inside their *** light of its effectiveness,this study introduces a new approach to accelerate the inspection of many mechanical parts with the same shape in a *** input to this problem is a volumetric image(i.e.,CT volume)of many parts obtained by a single CT *** need to segment the parts in the volume to inspect each of them;however,random postures and dense contacts of the parts prohibit part segmentation using traditional template *** address this problem,we convert both the scanned volumetric images of the template and the binned parts to simpler graph structures and solve a subgraph matching problem to segment the *** perform a distance transform to convert the CT volume into a distance ***,we construct a graph based on Morse theory,in which graph nodes are located at the extremum points of the distance *** experimental evaluation demonstrates that our fully automatic approach can detect target parts appropriately,even for a heap of 50 ***,the overall computation can be performed in approximately 30 min for a large CT volume of approximately 2000×2000×1000 voxels.

关键词： X-ray computed tomography(CT) volume segmentation graph matching non-destructive inspection

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Optimization of fuel consumption and NO_(x) emission for mild HEV via hierarchical model predictive control

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Control Theory and Technology 2022年第2期20卷 221-234页

作者： Yuka Umezawa Ken yamauchi Hiroki Seto Toshiro Imamura Toru Namerikawa Graduate School of Science and Technology Keio University3-14-1 HiyoshiKohoku-ku.YokohamaKanagawa 223-8522Japan Isuzu Advanced Engineering Center Ltd 8 TsuchidanaFujisawa.Kanagawa 252-0881.Japan

In this paper,we consider the fuel economy optimization problem for a mild hybrid electric vehicle(HEV)using hierarchical model predictive *** the proposed algorithm,two problems are addressed:eco-driving and torque *** the eco-driving problem,vehicle speed was *** the reduction in fuel consumption and NOx emissions,the torque required to follow the target speed was ***,in the torque distribution problem,the distribution between the engine and motor torques were *** this phase,engine characteristics were *** problems differ in terms of time scales;therefore,a hierarchical model predictive control is ***,the numerical simulation results demonstrated the efficacy of this research.

关键词： Mild HEV Energy management Model predictive control Hierarchical control

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Porous Metal Nanocrystal Catalysts:Can Crystalline Porosity Enable Catalytic Selectivity?

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CCS Chemistry 2022年第6期4卷 1829-1842页

作者： Xiaowen Min Hao Lv Yusuke yamauchi Ben Liu Key Laboratory of Green Chemistry and Technology of the Ministry of Education College of ChemistrySichuan UniversityChengdu 610064 Australian Institute for Bioengineering and Nanotechnology(AIBN) School of Chemical EngineeringThe University of QueenslandBrisbaneQLD 4072 JST-ERATO yamauchi Materials Space-Tectonics Project International Research Centre for Materials Nanoarchitechtonics(WPI-MANA)National Institute for Materials Science(NIMS)TsukubaIbaraki 305-0044

Catalytic selectivity is a central issue in the efficiency of catalytic processes.A large number of strategies have been developed to improve the catalytic selectivity of metal catalysts at the atomic and molecular levels,for instance,alloying secondary elements,fabricating metal-support interactions,and introducing surface ***,macro/mesoscopic pores and cavities have been demonstrated as an alternative route to promote catalytic selectivity of metal nanocrystal *** promotion effects of continuous crystalline porosity include(1)more catalytically active sites that accelerate the favorable catalytic routes to targeted products,(2)confined spaces that increase the retention time of key intermediates and remarkably promote the selective catalysis toward desired products,and(3)an optimized electronic structure and coordination environment of active metal sites that tailor the reaction trends of selective catalysis toward desired *** this minireview,we summarize recent advances in porosity-enabled catalytic selectivity of metal nanocrystal catalysts with focused discussions of CO_(2) reduction electrocatalysis and selective hydrogenation *** mechanisms that allow for the continuous porosity that enables the catalytic selectivity of metal nanocrystal catalysts are discussed in *** end this minireview by proposing current challenges and offering future opportunities in this research field.

关键词： porous metal continuous crystalline porosity structural synergy confinement catalytic selectivity

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Metal−Organic Frameworks:A Robust Platform for Creating Nanoarchitectured Carbon Materials

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Accounts of Materials Research 2022年第4期3卷 426-438页

作者： Chaohai Wang Yiyuan Yao Jiansheng Li Yusuke yamauchi Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse Key Laboratory of New Membrane MaterialsMinistry of Industry and Information TechnologySchool of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094People’s Republic of China Australian Institute for Bioengineering and Nanotechnology(AIBN) The University of QueenslandBrisbaneQueensland 4072Australia International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)TsukubaIbaraki 305-0044Japan

CONSPECTUS:Nanoporous carbon(NPC)materials with various architectures have attracted considerable attention because of their distinctive properties and great application potential in environmental remediation,energy conversion and storage,advanced sensors,and other *** methods for the synthesis of NPCs,for example,the pyrolysis of natural products or polymers,template-assisted synthesis,and using deep-eutectic solvents,always involve toxic precursors and complex procedures,which greatly hinder further ***,it is highly desirable to explore simple and feasible ways to prepare ***,to improve the performance and extend the application fields of NPCs,efficient strategies should be developed to regulate the components at the atomic level and construct multidimensional architectures.

关键词： synthesis pyrolysis hinder

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Biomass-derived carbon doping to enhance the current carrying capacity and flux pinning of an isotopic Mg^(11)B_(2)superconductor

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Journal of Magnesium and Alloys 2022年第7期10卷 1868-1877页

作者： M.Shahbazi Y.Hao D.Patel H.Liang Y.yamauchi M.S.A.Hossain QUT Centre for Materials Science and School of Chemistry and Physics Queensland University of Technology(QUT)BrisbaneQLD 4001Australia School of Mechanical and Mining Engineering Faculty of EngineeringArchitecture and Information Technology(EAIT)The University of QueenslandBrisbaneQLD 4072Australia Australian Institute for Bioengineering and Nanotechnology(AIBN) The University of QueenslandBrisbaneQLD 4072Australia JST-ERATO yamauchi Materials Space-Tectonics Project and International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)1-1 NamikiTsukubaIbaraki 305-0044Japan

Low activation isotopic boron(11B)based magnesium diboride(Mg^(11)B_(2))superconductors doped with biomass-derived activated carbon were synthesized using11B and magnesium powder via solid-state *** effect of carbon doping on the lattice structure and superconducting properties of Mg^(11)B_(2)bulks were evaluated using X-ray powder diffraction,high resolution transmission electron microscopy,scanning electron microscopy and magnetization *** refinement of structural parameters indicates successful substitution of carbon in Mg^(11)B_(2)*** critical current density(Jc)of carbon doped Mg^(11)B_(2)synthesized at 650℃was enhanced more than two times compared with the pure Mg^(11)B_(2)*** improvement was observed for the Mg^(11)B_(2)bulks heat-treated at 800℃.This enhancement is due to successful substitution of biomass-derived carbon with high surface area into Mg^(11)B_(2)*** flux pinning mechanism of pure and doped Mg^(11)B_(2)bulks were investigated using the Dew-Hughes *** study provides information regarding enhancement of the Jc of low activation Mg^(11)B_(2)superconductors suitable for next-generation fusion magnets.

关键词： Magnesium diboride Critical current Flux pinning mechanism Fusion reactor applications

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Photo-enhanced rechargeable high-energy-density metal batteries for solar energy conversion and storage

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Nano Research Energy 2022年第1期1卷 22-42页

作者： Hairong Xue Hao Gong Yusuke yamauchi Takayoshi Sasaki Renzhi Ma International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)1-1 NamikiTsukubaIbaraki 305-0044Japan Department of Chemistry and Materials Science College of ScienceNanjing Forestry UniversityNanjing 210037China Australian Institute for Bioengineering and Nanotechnology(AIBN)and School of Chemical Engineering The University of QueenslandBrisbaneQueensland 4072Australia JST-ERATO yamauchi Materials Space-Tectonics Project National Institute for Materials Science(NIMS)1-1 NamikiTsukubaIbaraki 305-0044Japan

Solar energy is considered the most promising renewable energy *** cells can harvest and convert solar energy into electrical energy,which needs to be stored as chemical energy,thereby realizing a balanced supply and demand for *** energy storage devices for this purpose,newly developed photo-enhanced rechargeable metal batteries,through the internal integration of photovoltaic technology and high-energy-density metal batteries in a single device,can simplify device configuration,lower costs,and reduce external energy *** review focuses on recent progress regarding the working principles,device architectures,and performances of various closed-type and open-type photo-enhanced rechargeable devices based on metal batteries,including Li/Zn-ion,Li-S,and Li/Zn-I_(2),and Li/Zn-O_(2)/air,Li-CO_(2),and Na-O_(2) *** addition to provide a fundamental understanding of photo-enhanced rechargeable devices,key challenges and possible strategies are also ***,some perspectives are provided for further enhancing the overall performance of the proposed devices.

关键词： Solar energy photo-electrochemistry rechargeable batteries metal batteries energy conversion and storage high energy density

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Ageing Society and Assistive Products

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稀有金属材料与工程 2006年第A3期35卷 67-70页

作者： Shigeru yamauchi Department of Health Science and Social Welfare Faculty of Human Sciences Waseda UniversityMikajima 2-579-15TokorozawaSaitama 359-1192Japan

North East Asian countries are facing to rapid increase in aged population *** most recent values of aged population ratios are 19.5%,8.7%,and 6.9%,for Japan,Korea and China,*** of the welfare services in the aged society is provision of assistive *** control systems are commonly adopted in modern assistive products and sensors are indispensable for control *** systems,such as fire alarm,smoke detectors,and gas leak detectors,have been regarded as indispensable to safety of elderly persons and persons with *** application of chemical sensors in home care of elderly persons is in the field of personal care and personal medical *** for personal medical treatment include that for medical treatment in home care and that to keep elderly persons *** market is expected in the latter one.

关键词： population ageing assistive products long term care personal mental treatment

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Recent progress in MgB_(2)superconducting joint technology

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镁合金学报(英文) 2023年第7期11卷 2217-2229页

作者： Hao Liang Dipak Patel Mahboobeh Shahbazi Andrzej Morawski Daniel Gajda Matt Rindfleisch Richard Taylor Yusuke yamauchi Md Shahriar A.Hossain School of Mechanical and Mining Engineering The University of QueenslandSt LuciaQueensland 4072Australia QUT Centre for Materials Science and School of Chemistry and Physics Queensland University of TechnologyBrisbaneQueensland 4001Australia Institute of High Pressure Physics Polish Academy of Sciences(PAS)Sokolowska 29/37Warsaw 01-142Poland Institute of Low Temperature and Structure Research Polish Academy of Sciences(PAS)Okólna 2Wrocław 50-422Poland Hyper Tech Research Inc.539 Industrial Mile RdColumbusOhio 43228USA Applied Superconductivity Laboratory Queensland University of TechnologyBrisbaneQueensland 4001Australia Australian Institute for Bioengineering and Nanotechnology(AIBN) The University of QueenslandSt LuciaQueensland 4072Australia Department of Materials Process Engineering Graduate School of EngineeringNagoya UniversityFuro-choChikusa-kuNagoya 464-8603Japan The Commonwealth Scientific and Industrial Research Organisation(CSIRO) LindfieldNew South Wales 2070Australia

Magnesium diboride(MgB_(2))magnets have the potential to be the next-generation liquid-helium-free magnet for magnetic resonance imaging(MRI)application due to their relatively high superconducting transition temperature,high current density and low raw material cost compared with current commercial niobium-titanium(Nb-Ti)magnets.A typical superconducting magnet includes several *** produce an ultra-stable magnetic field for imaging in MRI,a superconducting electromagnet operating in a persistent mode is *** coils of the electromagnet in MRI are short-circuited to operate in the persistent mode by connecting coils with superconducting ***-sistent joints have been demonstrated for in-situ and ex-situ wires of both mono-and multi-filamentary structures,made predominantly by PIT techniques similar to those used in wire *** realise further engagement of MgB_(2)in MRI applications,enhancing the performance of MgB_(2)superconducting joints is *** literature review summarises research and development on MgB_(2)superconducting joining technology.

关键词： MgB_(2) Superconducting joints Persistent-mode magnets MRI application Field-decay measurement

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