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高性能的新款MIRAI燃料电池堆的研究进展

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汽车与新动力 2021年第6期4卷 15-19页

作者： T.YOShIZUMI[日] h.kubo[日] M.OKUMURA[日] 吴玲(译) 不详

2014年,丰田汽车公司推出了全球首款商用燃料电池汽车(FCV)MIRAI[1]。与第1代MIRAI车型使用的燃料电池(FC)电堆相比,新款MIRAI车型使用的燃料电池堆采用了新的双极板流道和改进的电极,成为世界上体积功率密度最高的产品之一,其功率密度... 详细信息

2014年,丰田汽车公司推出了全球首款商用燃料电池汽车(FCV)MIRAI[1]。与第1代MIRAI车型使用的燃料电池(FC)电堆相比,新款MIRAI车型使用的燃料电池堆采用了新的双极板流道和改进的电极,成为世界上体积功率密度最高的产品之一,其功率密度为5.4kW/L(不包括端板),性能比第1代MIRAI车型的燃料电池堆提高了1.5倍[2]。提高电流密度是提高动力系统功率性能、减小体积的重要手段,双极板的作用是在电池内部合理地分配气体和排水,以稳定电流的产生。传统的直流通路容易被水淹没,很难维持稳定的电流。为了提高氧气的扩散效率,设计了1个局部窄流道,而不需要在原燃料电池堆中采用三维网格流场。这项新技术可使催化剂层中的氧浓度比传统的直流通道高2.3倍。除双极板外,催化剂载体和离聚物也得到了改进。铂(Pt)表面的离聚物会引起磺酸中毒,导致催化活性下降。为了解决这一难题,开发了介孔碳作为催化剂载体,在介孔碳的孔中携带Pt,通过减少离聚物与Pt表面的接触来抑制磺酸中毒。采用了1种高透氧离聚物,其透氧性能是先前燃料电池堆使用的离聚物的3倍。

关键词：燃料电池堆电池组性能电极

从重油生产烯烃——用焦炭流化床法使重石油馏分热裂解以生产乙烯和丙烯

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化学工业与工程 1985年第3期 38-48页

作者： N.Fujita Y.Kumagai Y.Shoji h.kubo T.Maruyama 李长芮郭雨东重油生产石化产品研究开发协会北京师范学院化学系天津石油化工公司日本、东京

大约30年以来,乙烷、丙烷、丁烷和石脑油等轻烃一直是石油化学工业的重要原料,而且这种趋势还将继续存在。从长远来看,轻烃的需要将不断增长,而重油则会充斥市场。这将导致经济增长的下降和加重环境保护的负担以及能源的多样化经营。轻... 详细信息

大约30年以来,乙烷、丙烷、丁烷和石脑油等轻烃一直是石油化学工业的重要原料,而且这种趋势还将继续存在。从长远来看,轻烃的需要将不断增长,而重油则会充斥市场。这将导致经济增长的下降和加重环境保护的负担以及能源的多样化经营。轻烃的高价及其在供求方面不断扩大的差距,已引起人们对轻烃在生产石油化工产品的可用性,表示焦虑。因此,已考虑其它原料如原油或它的比较重的馏分作为烯烃生产的有前途的资源。利用比较重的油作为石油化学工业的原料生

关键词：重油残油石油燃料焦炭粒子石油馏分裂化反应器流化床法烯烃脂肪族不饱和烃热裂解

Progress in Physics and Technology Developments for the Modification of JT-60

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Plasma Science and Technology 2004年第1期6卷 2141-2150页

作者： h.Tamai M.Matsukawa G.Kurita N.hayashi K.Urata Y.M.Miura K.Kizu K.Tsuchiya A.Morioka Y.Kudo S.Sakurai K.Masaki T.Suzuki M.Takechi Y.Kamada A.Sakasai S.Ishida K.Abe A.Ando T.Cho T.Fujii T.Fujita S.Goto K.hananda A.hatayama T.hino h.horiike N.hosogane M.Ichimura Tsuji-Iio S.Itoh M.Katsurai M.Kikuchi A.Kohyama h.kubo M.Kuriyama M.Matsuoka Y.Miura N.Miya T.Mizuuchi K.Nagasaki h.Ninomiya N.Nishino Y.Ogawa K.Okano T.Ozeki M.Saigusa M.Sakamoto M.Satoh M.Shimada R.Shimada M.Shimizu T.Takagi Y.Takase T.Tanabe K.Toi Y.Ueda Y.Uesugi K.Ushigusa Y.Yagi T.Yamamoto K.Yatsu K.Yoshikawa Japan Atomic Energy Research Institute Naka Ibarahi 311-0193 Japan Tohoku University University of Tsukuba Osaka University Kyushu University Keio University hokkaido University Tokyo Institute of Technology the University of Tokyo Kyoto University Mie University hiroshima University Central research Institute of Electric Power Industry Ibaraki University ITER JCT Nagoya University National Institute for Fusion Science Kanazawa University National Institute of Advanced Industrial Science and Technology

Recent progress in the physics and engineering design study for themodification programme of JT-60 is presented. In order to achieve a steady state high-βplasmaoperation, which is the dominant issue of this programme, physics design for the MhD control and thestability analysis is investigated. Engineering design and the R & D for the superconducting coils,irradiation shield are performed well towards the mission of programme.

关键词： modification of JT-60 physics design technology developments

Practical BRDF reconstruction using reliable geometric regions from multi-view stereo

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Computational Visual Media 2019年第4期5卷 325-336页

作者： Taishi Ono hiroyuki kubo Kenichiro Tanaka Takuya Funatomi Yasuhiro Mukaigawa Nara Institute of Science and Technology IkomaNara 630-0192Japan

In this paper,we present a practical method for reconstructing the bidirectional reflectance distribution function(BRDF)from multiple images of a real object composed of a homogeneous *** key idea is that the BRDF can be sampled after geometry estimation using multi-view stereo(MVS)*** contribution is selection of reliable samples of lighting,surface normal,and viewing directions for robustness against estimation errors of *** method is quantitatively evaluated using synthesized images and its effectiveness is shown via real-world experiments.

关键词： BRDF reconstruction multi-view stereo(MVS) photogrammetry rendering

Statistical modeling of nitrogen-dependent modulation of root system architecture in Arabidopsis thaliana

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Journal of Integrative Plant Biology 2016年第3期58卷 254-265页

作者： Takao Araya Takuya kubo Nicolaus von Wiren hideki Takahashi Department of Biochemistry and Molecular Biology Michigan State UniversityEast LansingM148824USA Molecular Plant Nutrition Leibniz Institute of Plant Genetics and Crop Plant ResearchD-06466 GaterslebenGermany Graduate School of Environmental Science Hokkaido UniversitySapporo 060-0810Japan

Plant root development is strongly affected by nutrient availability. Despite the importance of structure and function of roots in nutrient acquisition,statistical modeling approaches to evaluate dynamic and temporal modulations of root system architecture in response to nutrient availability have remained as widely open and exploratory areas in root biology. In this study,we developed a statistical modeling approach to investigate modulations of root system architecture in response to nitrogen availability. Mathematical models were designed for quantitative assessment of root growth and root branching phenotypes and their dynamic relationships based on hierarchical con figuration of primary and lateral roots formulating the fishbone-shaped root system architecture in Arabidopsis thaliana. Time-series datasets reporting dynamic changes in root developmental traits on different nitrate or ammonium concentrations were generated for statistical analyses. Regression analyses unraveled key parameters associated with：（i） inhibition of primary root growth under nitrogen limitation or on ammonium;（ii） rapid progression of lateral root emergence in response to ammonium; and（iii） inhibition of lateral root elongation in the presence of excess nitrate or ammonium. This study provides a statistical framework for interpreting dynamic modulation of root system architecture,supported by metaanalysis of datasets displaying morphological responses of roots to diverse nitrogen supplies.

关键词： Ammonium mathematical modeling nitrate nitrogen root system architecture

high Density Plasma heating by EC-Waves Injected from the high-Field Side for Mode Conversion to Electron Bernstein Waves in LhD

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Plasma Science and Technology 2013年第2期15卷 93-96页

作者： Y.YOShIMURA S.kubo T.ShIMOZUMA h.IGAMI h.TAKAhAShI M.NIShIURA S.OGASAWARA R.MAKINO T.MUTOh h.YAMADA A.KOMORI National Institute for Fusion Science 322-6 Oroshi-cho Toki 509-5292 Japan Dept. of Energy Science and Technology Nagoya Univ.Nagoya 464-8463 Japan

To realize an excitation of electron Bernstein waves （EBW） via mode conversion from X-mode waves injected from the high magnetic field side （hFS）, new inner-vessel mirrors were installed close to a helicM coil in the large helicM device （LhD）. 77 Ghz electron cyclotron （EC） wave beams injected from an existing EC-wave injection system toward the new mirror are reflected on the mirror so that the beams are injected to plasmas from hFS. Evident increases in the electron temperature at the plasma core region and the plasma stored energy were observed by the hFS beam injection to the plasmas with the line-average electron density of 7.5~ 1019 m-3, which is slightly higher than the plasma cut-off density of 77 Ghz EC-waves, 7.35~ 1019 m-3. The heating efficiency evaluated from the changes in the time derivative of the plasma stored energy reached ,,~70%. Although so far it is not clear which is the main cause of the heating effect, the mode-converted EBW or the X-mode wave itself injected from the hFS, an effective heating of high-density plasma over the plasma cut-off of EC-wave was successfully demonstrated.

关键词： electron Bernstein wave EBW slow X-B overdense high density plasmaheating high-field side injection ECh LhD

Acquiring non-parametric scattering phase function from a single image

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Computational Visual Media 2018年第4期4卷 323-331页

作者： Yuki Minetomo hiroyuki kubo Takuya Funatomi Mikio Shinya Yasuhiro Mukaigawa Nara Institute of Science and Technology 8916-5 Takayama-choIkomaNara630-0192Japan. Toho University 2-2-1 MiyamaFunabashiChiba274- 8510Japan. Dwango CG Research KADOKAWA Hongo Bldg.5-24-5 HongoBunkyo-kuTokyo113-0033Japan.

Acquiring accurate scattering properties is important for rendering translucent materials. In particular, the phase function, which determines the distribution of scattering directions, plays a significant role in the appearance of a material. We propose a distinctive scattering theory that approximates the effect of single scattering to acquire the non-parametric phase function from a single image. Furthermore, in various experiments, we measured the phase functions from several real diluted media and rendered images of these materials to evaluate the effectiveness of our theory.

关键词： scattering phase function measurement rendering

Precision Synthesis of End-Functionalized Star Poly(vinyl alcohol)s by RAFT Polymerization and Post-polymerization Modification

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Precision Chemistry 2023年第4期1卷 256-263页

作者： Gaishi Murakami Tomohiro kubo Kotaro Satoh Department of Chemical Science and Engineering Tokyo Institute of TechnologyMeguro-kuTokyo 152-8550Japan

Poly(vinyl alcohol)(PVA)has been widely used in industrial and consumer *** this study,we aimed to address this challenge by synthesizing well-defined multiarm poly(vinyl acetate)(PVAc)through the use of nonhydrolyzable vinyl ethertype multifunctional RAFT *** control over molecular weights was achieved by the RAFT process to afford polymers with dominant head-to-head linkages at the ***,quantitative end-functionalization of the synthesized PVAc was performed using Michael thiol−ene or disulfide exchange ***,saponification of the PVAc enabled the synthesis of end-functionalized multiarm PVA in an efficient *** straightforward approach afforded well-defined functional PVAs,which enable further chemical modification,thus widening the utility of PVA in a range of applications,such as precisely controlled network synthesis and bioconjugation.

关键词： Poly(vinyl alcohol) Poly(vinyl acetate) RAFT Polymerization Star Polymers End-Functional Polymers Michael Thiol-Ene Reaction

Synthesis and Properties of a Through-Space Interacting Diradicaloid

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Precision Chemistry 2023年第3期1卷 183-191页

作者： Takuya Kodama Yasukazu hirao Takashi kubo Department of Chemistry Graduate School of ScienceOsaka UniversityToyonakaOsaka 560-0043Japan Innovative Catalysis Science Division Institute for Open and Transdisciplinary Research Initiatives(ICSOTRI)Osaka UniversitySuitaOsaka 565-0871Japan

Knowledge about electronic structures is important to gain an understanding of the unique functional properties of *** this study,we synthesized and characterized a diradicaloid in which two phenalenyl radical sites are coupled antiferromagnetically via a through-space *** results of quantum chemical,physicochemical(^(1)h NMR,electronic absorption,cyclic voltammetry,SQUID,ESR),and chemical reactivity studies show that this diradicaloid has singlet diradical *** assessment of the nature of the bonding interaction between two radical sites in this species using DFT calculations demonstrates that a small spatial overlap between the two SOMOs in this diradicaloid provides an efficient electron exchange path for the singlet state to be substantially lower in energy than the triplet state.

关键词： through-space interaction phenalenyl radical singlet diradical diradicaloid antiferromagnetic interaction