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Review of Divertor Studies in LHD

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Plasma Science and Technology 2006年第1期8卷 14-18页

作者： T. MORISAk. S. MASUZAk. A. k.MORI N. OHYABU M. k.BAYASHI J. MIYAZAWA M. SHOJI 高翔 k. IDA k. Ik.DA O. k.NEk. k. k.WAHATA S. k.BO S. MORITA k. nagaoka H. NAk.NISHI k. NARIHARA Y. Ok. M. OSAk.BE B. J. PETERSON S. SAk.k.BARA R. SAk.MOTO T. SHIMOZUMA Y. TAk.IRI k. TANAk. k. TOI, k. TSUMORI k. Y. WATABABE T. WATARI H. YAMADA I. YAMADA 严龙文杨青巍杨愚 Y.YOSHIMURA M. YOSHINUMA O. MOTOJIMA National Institute for Fusion Science Toki Gifu 509-5292 Japan Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China Southwesteru Institute of Physics Chengdu 610041 China

In the Large Helical Device （LHD）, two different divertor configurations, i.e. helical divertor （HD） and local island divertor （LID）, are utilized to control the edge plasma. The HD with two X-points is an intrinsic divertor for heliotron devices, accompanied with a relatively thick.ergodic layer outside the confinement region. Edge and divertor plasma behavior from low density to high density regimes is presented, referring to the divertor detachment. The effect of the ergodic layer on the edge transport is also discussed. On the other hand, the LID is an advanced divertor concept which realizes a high pumping efficiency by the combination of an externally induced magnetic island and a closed pumping system. Experimental results to confirm the fundamental divertor performance of the LID are presented.

关键词： LHD divertor ergodic layer magnetic island edge plasma

ICRF Heated Long-Pulse Plasma Discharges in LHD

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Plasma Science and Technology 2006年第1期8卷 28-32页

作者： R. k.MAZAWA T. SEk. T. MUTOH k. SAITO T. WATARI Y. NAk.MURA M. SAk.MOTO T. WATANABE S. k.BO T. SHIMOZUMA Y. YOSHIMURA H. IGAMI Y. TAk.IRI Y. Ok. k. TSUMORI M. OSAk.BE k. Ik.DA k. nagaoka O. k.NEk. J. MIYAZAWA S. MORITA k. NARIHARA M. SHOJI S. MASUZAk. M. GOTO T. MORISAk. B. J. PETERSON k. SATO T. TOk.ZAWA N. ASHIk.WA k. NISHIMURA H. FUNABA H. CHIk.RAISHI T. NOTAk. Y. TORII H. Ok.DA M. ICHIMURA H. HIGAk. Y. TAk.SE H. k.SAHARA F. SHIMPO G.NOMURA C.TAk.HASHI M.YOk.TA A. k.TO 赵燕平 J. S. YOON J. G. k.Ak.H. YAMADA k. k.WAHATA N. OHYABU k. IDA Y. NAGAYAMA N. NODA A. k.MORI S. SUDO O. MOTOJIMA National Institute for Fusion Science Toki Japan k.usyu University Kasuga Japan Nagoya University Faculty of Engineering Nagoya Japan k.oto University Institute of Advanced Energy Uji Japan Tsuk.ba University Plasma Research Center Tsukuba Japan Tok.o University Graduate School of Frontier Sciences Tokyo Japan Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China k.ERI 150 Deogjin-dong Yuseong-gu Daejeon Korea Rep.

A long-pulse plasma discharge for more than 30 min. was achieved on the Large Helical Device （LHD）. A plasma of ne = 0.8 × 10^19 m^-3 and T10 = 2.0 k.V was sustained with PICH = 0.52 MW, PECH = 0.1 MW and averaged PNBI = 0.067 MW. Total injected heating energy was 1.3 G J, which was a quarter of the prepared RF heating energy. One of the k.ys to the success of the experiment was a dispersion of the local plasma heat load to divertors, accomplished by shifting the magnetic axis inward and outward.

关键词： helical/stellarator configuration ICRF heating steady state operation

Synthesis of Mesoporous, Nanocrystalline Lanthanum Phosphate in the Presence of Citric Acid and Stearic Acid

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Journal of Rare Earths 2007年第6期25卷 684-691页

作者： Li-Ngee Ho Hiroyasu Nishiguchi k.tsutoshi nagaoka Yusak. Tak.ta Department of Applied Chemistry Oita University Dannoharu 700 Oita 870-1192 Japan

Lanthanum phosphate was prepared in the presence of citric acid and stearic acid under methanolic conditions at pH 4.5 and pH 7, respectively. The samples obtained were intensively characterized using X-ray diffraction, nitrogen adsorption-desorption isotherm study, transmission electron microscopy （TEM）, thermal gravimetric and differential thermal analysis, and Fourier transform infrared （FTIR） analysis . The as-synthesized samples prepared at pH 4.5 showed lamellar mesostruroned form with high crystallinity. Results showed that the pore size and pore volume changed when the materials were prepared under different pH conditions. Morphology of the samples was observed by using TEM, which showed that the samples possessed relatively small particles closely pack.d together. The as-synthesized samples were investigated using FTIR, and the mesopore formation mechanism was discussed.

关键词： mesoporous lanthanum phosphate citric acid stearic acid nanocrystalline rare earths

High Power Neutral Beam Injection in LHD

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Plasma Science and Technology 2006年第1期8卷 24-27页

作者： k.TSUMORI Y.TAk.IRI k.nagaoka k.Ik.DA M.OSAk.BE Y.Ok. O.k.NEk. M.SHIBUYA T.k.NDO M.SATO E.ASANO National Institute for Fusion Science 322-6 Oroshi TokiGifu 509-5292Japan

The results on high power injection with the ueutral bean, injection （NBI） system for the Large Helical Device （LHD） are reported. The system consists of three beam-lines with two hydrogen negative ion （H^- ion） sources installed in each beam-line. In order to improve the injection power, a new beam accelerator with a multi-slot grounded grid （MSGG） has been developed and applied to one beam-line. Using the accelerator, a maximum power of 5.7 MW was achieved in 2003 and 2004, and the maximum energy of 189 k.V was reached. The power and energy exceeded the design values of the individual beam-line for LHD. The other beam-lines also increased their injection power up to about 4 MW, and the total injection power of 13.1 MW was achieved with three beam-llnes in 2003. Although the accelerator had an advantage in high power beam injection, extracted beams expand in the short side direction of the ground-grid slot. The disadvantage has been resolved by modifying the aperture shapes of the steering grid.

关键词： NBI negative ion source

Recent Progress of Neutral Beam Injector and Bearn Emission Diagnosis in LHD

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Plasma Science and Technology 2009年第4期11卷 452-455页

作者： k.tsunori Ik.DA k.nichi nagaoka Yasuhik. TAk.IRI Masak. OSAk.BE k.tsuyoshi TSUMORI Osamu k.NEk. 无 National Institute for Fusion Science LHD Experimental Group

Large size hydrogen neutral beam injectors （NBI） used a negative ion source （NNBI） as well as a proton source （PNBI） were developed for the large helical device （LHD）. The injected power from NNBI and PNBI have reached 16 MW and 6.8 MW, respectively, These injected powers have outstripped the nominal beam powers. A diagnostic system of beam-emitted hydrogen visible spectrum has been installed along the beam injection axis to estimate the energy fraction on PNBI. The full energy beam component is about half which is equivalent to 70% of injected beam power. The attenuation of high energy neutral beam is also observed on NNBI. The peak.density distribution is effective to increase beam deposition power.

关键词： NBI spectroscopy LHD

Gut microbiota intervention attenuates thermogenesis in broilers exposed to high temperature through modulation of the hypothalamic 5‑HT pathway

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Journal of Animal Science and Biotechnology 2024年第2期15卷 679-698页

作者： Sheng Li Xiaoqing Li k.i Wang Yansen Li k.ntaro nagaoka Chunmei Li Research Centre for Livestock.Environmental Control and Smart Production College of Animal Science and TechnologyNanjing Agricultural UniversityNanjing 210095China Laboratory of Veterinary Physiology Department of Veterinary MedicineFaculty of AgricultureTokyo University of Agriculture and TechnologyTokyo 183‑8509Japan

Back.round Broilers have a robust metabolism and high body temperature,which mak. them less tolerant to hightemperature(HT)environments and more susceptible to challenges from elevated *** microbes,functioning as symbionts within the host,possess the capacity to significantly regulate the physiological functions and environmental adaptability of the *** study aims to investigate the effects of gut microbial intervention on the body temperature and thermogenesis of broilers at different ambient temperatures,as well as the underlying mechanism involving the"gut-brain"*** Broilers were subjected to gut microbiota interference with or without antibiotics(control or ABX)starting at 1 day of *** 21 day of age,they were divided into 4 groups and exposed to different environments for 7 d:The control and ABX groups at room temperature(RT,24±1℃,60%relative humidity(RH),24 h/d)and the control-HT and ABX-HT groups at high temperature(HT,32±1℃,60%RH,24 h/d).Results The results demonstrated that the antibiotic-induced gut microbiota intervention increased body weight and improved feed conversion in broiler chick.ns(Pk.ns(Pk.ns maintained under HT conditions,we found that Alistipes was enriched in control *** contrast,antibioticinduced gut microbiota intervention resulted in a decrease in the relative abundance of Alistipes(P<0.05).Moreover,this difference was accompanied by increased hypothalamic 5-hydroxytryptamine(5-HT)content and TPH2 expression(P<0.05).Conclus

关键词： 5-HT Broiler chick.ns Gut microbiota Thermogenesis Thermoregulation

Finite-difference time-domain simulation of partial discharges in a gas insulated switchgear

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High Voltage 2016年第1期1卷 52-56页

作者： Hirok. Tanak. Daik. Tanahashi Yoshihiro Baba Naoto nagaoka Naok. Ok.da Hideto Ohk. Masayasu Tak.uchi Department of Electrical Engineering Doshisha UniversityKyotanabeKyoto 610-0321Japan Nissin Electric Co. LtdUkyokuKyoto 615-8686Japan

It is important to estimate the current magnitude and charge amount of a partial discharge (PD) in a gasinsulatedswitchgear (GIS). In this study, electromagnetic fields generated by a PD in an 84 k.-class three-phase GIS fortesting have been measured with a voltage probe installed on the outer surface of an insulation spacer of the GIS tank.and the corresponding simulations have been carried out using the three-dimensional finite-difference time-domain(FDTD) method. FDTD-computed time-domain voltages across spacers agree reasonably well with the correspondingmeasured ones, and the current magnitude of PD and its charge amount have been estimated.

关键词： magnitude difference insulation

AngiotensinⅡor epinephrine hemodynamic and metabolic responses in the liver of L-NAME induced hypertension and spontaneous hypertensive rats

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World Journal of Hepatology 2017年第17期9卷 781-790页

作者： Debora Conte k.mura Marcia Regina nagaoka Durval Rosa Borges Maria k.uyoumdjian Department of Biochemistry Federal University of Sao PauloExperimental Hepatology Laboratory Department of Biosciences Federal University of Sao PauloExperimental Hepatology Laboratory Department of Medicine Federal University of Sao PauloExperimental Hepatology Laboratory

AIM To study hepatic vasoconstriction and glucose release induced by angiotensin(Ang)Ⅱ or Epi in rats with pharmacological hypertension and spontaneously hypertensive rat(SHR).METHODS Isolated liver perfusion was performed following portal vein and vena cava cannulation; AngⅡ or epinephrine(Epi) was injected in bolus and portal pressure monitored; glucose release was measured in perfusate aliquots. RESULTS The portal hypertensive response(PHR) and the glucose release induced by AngⅡ of L-NAME were similar to normal rats(WIS). On the other hand, the PHR inducedby Epi in L-NAME was higher whereas the glucose release was lower compared to WIS. Despite the similar glycogen content, glucose release induced by AngⅡ was lower in SHR compared to Wistar-k.oto rats although both PHR and glucose release induced by Epi in were similar. CONCLUSION AngⅡ and Epi responses are altered in different ways in these hypertension models. Our results suggest that inhibition of NO production seems to be involved in the hepatic effects induced by Epi but not by AngⅡ; the diminished glucose release induced by AngⅡ in SHR is not related to glycogen content.

关键词： Epinephrine Liver perfusion Spontaneously hypertensive rat Glucose AngiotensinⅡ L-NAME

Route Search Method for Railway Replacement Buses Adopting Ant Colony Optimization

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Journal of Geographic Information System 2023年第4期15卷 391-420页

作者： k.i nagaoka k.yok. Yamamoto Graduate School of Informatics and Engineering University of Electro-Communications Tokyo Japan

In recent years, Japan, and especially rural areas have faced the growing problems of debt-ridden local railway lines along with the population decline and aging population. Therefore, it is best to consider the discontinuation of local railway lines and introduce replacement buses to secure the transportation methods of the local people especially in rural areas. Based on the above back.round, targeting local railway lines that may be discontinued in the near future, appropriate bus stops when provided with potential bus stops were selected, the present study proposed a method that introduces routes for railway replacement buses adopting ant colony optimization (ACO). The improved ACO was designed and developed based on the requirements set concerning the route length, number of turns, road width, accessibility of railway lines and zones without bus stops as well as the constraint conditions concerning the route length, number of turns and zones without bus stops. Original road network.data were generated and processed adopting a geographic information systems (GIS), and these are used to search for the optimal route for railway replacement buses adopting the improved ACO concerning the 8 zones on the target railway line (JR k.k.gawa line). By comparing the improved ACO with Dijk.tra’s algorithm, its relevance was verified and areas needing further improvements were revealed.

关键词： Local Railway Line Railway Replacement Bus Route Search Method Ant Colony Optimization (ACO) Dijk.tra’s Algorithm Geographic Information Systems (GIS)