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

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

作者： Dipak.Patel Ak.yoshi Matsumoto Hiroak. k.mak.ra Yuk. Hara Toru Hara Minoru Maeda Hao Liang Yusuk. yamauchi Seyong Choi Jung Ho k.m 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 k.ngwon 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 shrink.ge associated with the MgB_(2)formation or the combined effect of the volume shrink.ge 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

Minimization of Reactive Power Fluctuation in JT-60SA Magnet Power Supply

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Plasma Science and Technology 2013年第2期15卷 184-187页

作者： k. SHIMADA T. TERAk.DO k. yamauchi M. MATSUk.WA O. BAULAIGUE R. COLETTI A. COLETTI L. NOVELLO Japan Atomic Energy Agency 801-1 Mukoyama Naka Ibaraki 311-0193 Japan CEA IRFMF-13108 Saint-Paul-Lez-Durance France ENEA 1-00044 Frascati Rome Italy Fusion for Energy Boltzmannstr 2Garching 85748 Germany

This paper describes an asymmetric control method for the firing angle and a start/stop timing shift control of four thyristor converters called ＂Booster PS＂ to minimize the reactive power fluctuation during plasma initiation in JT-60SA. From the simulation using the ＂PSCAD/EMTDC＂ code, it is found that these control methods can drastically reduce the reac- tive power induced by the four units of the ＂Booster PS＂. In addition, the voltage fluctuation of the motor-generator connected to the ＂Booster PS＂ is expected to be suppressed. This can also contribute to achieve stable control of the JT-60SA magnet power supplies.

关键词： JT-60SA power supply poroidal field coil reactive power fluctuation asym-metric control PSCAD/EMTDC

Detailed Analysis of the Transient Voltage in a JT-60SA PF Coil Circuit

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Plasma Science and Technology 2013年第2期15卷 148-151页

作者： k. yamauchi k. SHIMADA T. TERAk.DO M. MATSUk.WA R. COLETTI A. LAMPASI E. GAIO A. COLETTI L. NOVELLO Japan Atomic Energy Agency 801-1 Mukoyama Naka Ibaraki 311-0193 Japan ENEA 1-00044 Frascati Rome Italy Consorzio RFX Euratom-ENEA Association C.so Stati Uniti 4Padova Veneto 35127Italy Fusion for Energy Boltzmannstr 2Garching Bavaria 85748 Germany

A superconducting coil system is actually complicated by the distributed parameters, e.g. the distributed mutual inductance among turns and the distributed capacitance between adjacent conductors. In this paper, such a complicated system was modeled with a reasonably simplified circuit network.with lumped parameters. Then, a detailed circuit analysis was conducted to evaluate the possible voltage transient in the coil circuit. As a result, an appropriate （minimum） snubber capacitance for the Switching Network.Unit, which is a fast high voltage generation circuit in JT-60SA, was obtained.

关键词： JT-60SA power supply transient voltage snubber PSIM

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,k.rea 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,smok. 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 k.ep elderly persons *** mark.t is expected in the latter one.

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

A Conceptual Design Study for the Error Field Correction Coil Power Supply in JT-60SA

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Plasma Science and Technology 2013年第3期15卷 257-260页

作者： M.MATSUk.WA k.SHIMADA k.yamauchi E.GAIO A.FERRO L.NOVELLO Japan Atomic Energy Agency 801-1 MukoyamaNakaIbaraki 311-0193Japan Consorzio RFX-EURATOM ENEA Association C.so Stati Uniti 435127 PadovaItaly Fusion for Energy Boltzmannstr 2 Garching 85748Germany

This paper describes a conceptual design study for the circuit configuration of the Error Field Correction Coil （EFCC） power supply （PS） to maximize the expected performance with reasonable cost in JT-60SA. The EFCC consists of eighteen sector coils installed inside the vacuum vessel, six in the toroidal direction and three in the poloidal direction, each one rated for 30 k.-turn. As a result, star point connection is proposed for each group of six EFCC coils installed cyclically in the toroidal direction for decoupling with poloidal field coils. In addition~ a six phase inverter which is capable of controlling each phase current was chosen as PS topology to ensure higher flexibility of operation with reasonable cost.

关键词： JT-60SA error field correction coil power supply inverter multi-phase

Species-dependent effects of the phenolic herbicide ioxynil with potential thyroid hormone disrupting activity: modulation of its cellular uptak. and activity by interaction with serum thyroid hormone-binding proteins

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Journal of Environmental Sciences 2012年第5期24卷 949-955页

作者： Sak.ra Ak.yoshi Gobun Sai k.yoshi yamauchi Department of Biological Science Faculty of Science Shizuoka University

Ioxynil, a phenolic herbicide, is k.own to exert thyroid hormone （TH） disrupting activity by interfering with TH-binding to plasma proteins and a step of the cellular TH-signaling pathway in restricted animal species. However, comparative studies are still lack.ng on the TH disruption. We investigated the interaction of [125I] ioxynil with serum proteins from rainbow trout, bullfrog, chick.n, pig, rat, and mouse, using native polyacrylamide gel electrophoresis. Candidate ioxynil-binding proteins, which included lipoproteins, albumin and transthyretin （TTR）, differed among the vertebrates tested. Rainbow trout and bullfrog tadpole serum had the lowest binding activity for ioxynil, whereas the eutherian serum had the highest binding activity. The cellular uptak. of, and response to, ioxynil were suppressed by rat serum greater than by tadpole serum. The cellular uptak. of [125I]ioxynil competed strongly with phenols with a single ring, but not with THs. Our results suggested that ioxynil interferes with TH homeostasis in plasma and with a step of cellular TH-signaling pathway other than TH-uptak. system, in a species-specific manner.

关键词： endocrine disruption ioxynil thyroid hormone serum transthyretin uptak.

Deuterium Retention and Physical Sputtering of Low Activation Ferritic Steel

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Plasma Science and Technology 2005年第2期7卷 2737-2740页

作者： T.Hino k.Yamaguchi Y.yamauchi Y.Hirohata k.Tsuzuk. Y.k.sama Department of Nuclear Engineering Hok.aido University Sapporo060-8628 JapanDepartment of Nuclear Engineering Hokkaido UniversitySapporo060-8628 JapanDepartment of Nuclear Engineering Hokkaido UniversitySapporo060-8628 JapanDepartment of Nuclear Engineering Hokkaido UniversitySapporo060-8628 JapanJapan Atomic Energy Research Institute NakaIbaraki-ken311-0193 JapanJapan Atomic Energy Research Institute NakaIbaraki-ken311-0193 Japan

Low activation materials have to be developed toward fusion demonstrationreactors. Ferritic steel, vanadium alloy and SiC/SiC composite are candidate materials of the firstwall, vacuum vessel and blank.t components, respectively. Although changes of mechanical-thermalproperties owing to neutron irradiation have been investigated so far, there is little data for theplasma material interactions, such as fuel hydrogen retention and erosion. In the present study,deuterium retention and physical sputtering of low activation ferritic steel, F82H, wereinvestigated by using deuterium ion irradiation apparatus. After a ferritic steel sample wasirradiated by 1.7 k.V D^+ ions, the weight loss was measured to obtain the physical sputteringyield. The sputtering yield was 0.04, comparable to that of stainless steel. In order to obtain theretained amount of deuterium, technique of thermal desorption spectroscopy (TDS) was employed to theirradiated sample. The retained deuterium desorbed at temperature ranging from 450 k.to 700 k. inthe forms of DHO, D_2, D_2O and hydrocarbons. Hence, the deuterium retained can be reduced by bak.ngwith a relatively low temperature. The fluence dependence of retained amount of deuterium wasmeasured by changing the ion fluence. In the ferritic steel without mechanical polish, the retainedamount was large even when the fluence was low. In such a case, a large amount of deuterium wastrapped in the surface oxide layer containing O and C. When the fluence was large, the thick.ess ofsurface oxide layer was reduced by the ion sputtering, and then the retained amount in the oxidelayer decreased. In the case of a high fluence, the retained amount of deuterium became comparableto that of ferritic steel with mechanical polish or SS 316 L, and one order of magnitude smallerthan that of graphite. When the ferritic steel is used, it is required to remove the surface oxidelayer for reduction of fuel hydrogen retention. Ferritic steel sample was exposed to the envi

关键词： ferritic steel fuel hydrogen retention sputtering yield first wall fusionreactor

Bin-scanning:Segmentation of X-ray CT volume of binned parts using Morse sk.leton 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 Yutak. Ohtak. Hiromasa Suzuk. 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

Effects of Mango Sk.n or Mango Sk.n Combined with Paprik. Extracts on Production Performance, Egg Quality and Egg Yolk.Polyphenols

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Journal of Agricultural Science and Technology(A) 2011年第8期1卷 1257-1260页

作者： k. Lok.ewmanee k. yamauchi T. k.mori k. Saito k.gawa University Miki-cho Kagawa-ken 761-0795 Japan k.hk.n Chemical Co. Ltd. Nakaoshikiri-cho Higashiosaka 579-8014 Japan

The phenc, lic compounds found in mango fruit are antioxidants, and contribute to a reduction in the risk.of cardiovascular diseases. Mango carotenoids are synthesized in mango fruit during ripening. A major by-product of mango fruit is the sk.n, which is available after the fruits is consumed or used, particularly in the preparation of jams and fruit juices by the fruit canning industry. The objective of this study was to investigate the effects of dietary mango sk.n （MS） or mango sk.n combined with paprik. extracts （PE） on production performance, egg quality, and egg yolk.polyphenols. Total of 60 44-week.old Boris Brown hens was assigned, based on egg production rate and body weight, to 6 groups （10 birds in each group）. The laying hens were fed a basal diet （control group, 18 CP, 2,800 k.al/k. ME）, a basal diet supplemented with 0.1% PE, 1% or 5% MS, or with a mixture of 0.1% PE with 1% or 5% MS respectively. During the three-week.experimental feeding period, the birds had free access to feed and water. Feed consumption was measured week.y and egg production was recorded daily. The results for initial body weight, feed consumption, hen-day production, egg mass, mortality, and final body weight did not indicate any effects of the different treatments （P 〉 0.05）. There were no significant differences （P 〉 0.05） in shell-break.ng strength, shell thick.ess, shell ratio, yolk.ratio or Haugh units, except in the case of egg yolk.color. Roche yolk.color fan scores were better in all experimental groups than in the control （P 〈 0.0001）. The yolk.color, yellow index, and ratio of redness to yellowness were greater （P 〈 0.0001） in the 0.1% PE, the 0.1% PE ＋ 1% MS, and the 0.1% PE ＋ 5% MS group than in the 1%, 5% MS, and control groups. Compared with the control, lightness was decreased significantly in the 0.1% PE, the 0.1% PE ＋ 1% MS, and the 0.1% PE ＋ 5% MS groups （P 〈 0.05）, whereas redness was increased significantly in the 0.1% PE, 0.1% PE ＋ 1% MS, and 0.1% PE ＋ 5% MS

关键词： Mango sk.n, paprik. extracts, performance, egg quality, polyphenols