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A Blowdown Cryogenic Cavitation Tunnel and CFD Treatment for Flow Visualization around a Foil

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Journal of Thermal Science 2005年第4期14卷 346-351页

作者： yutaka ITO Kazuya SAWASAKI Naoki TANI Takao NAGASAKI Toshio NAGASHIMA Tokyo Institute of Technology G3-334259Nagatsuta-choMidori-kuYokohama226-8502Japan Honda Motor Co.Ltd. 2-1-1Minami-AoyamaMinato-kuTokyo107-8556Japan Japan Aerospace Exploration Agency 2-1-1SengenTsukuba305-8505Japan University of Tokyo 7-3-1HongoBunkyo-kuTokyo113-8656Japan

成穴是在火箭引擎的发展的主要问题之一。有很少试验性的研究设想低温实验法的陪衬成穴。因此， blowdown 类型的一条新低温实验法的成穴隧道被造。陪衬形状是鈥減l ano 凸的鈥吗？因为简洁，这侧面被选择，而且类似于为火箭 inducer im... 详细信息

成穴是在火箭引擎的发展的主要问题之一。有很少试验性的研究设想低温实验法的陪衬成穴。因此， blowdown 类型的一条新低温实验法的成穴隧道被造。陪衬形状是鈥減l ano 凸的鈥吗？因为简洁，这侧面被选择，而且类似于为火箭 inducer impeller 的。工作液体是在房间温度，热水和液体氮的水。在攻击(AOA )=8 掳的角度的情况下，期刊洞离开在 90 掳 C 和氮在两水的实验被观察在 ? 在一样的速度下面的 190 掳 C 10 m/sec 和一样的成穴数 0.7。频率被观察分别地，是 110 和 90 Hz 并且几乎旋涡从陪衬流与那些与一致。温度消沉特别在低温实验法的成穴在实验和模拟由于热力学的效果被证实。关键词成穴 - 隧道 - 致冷剂 - CFD - 可视化 - 模拟 - 陪衬 CLC 数字

关键词：低温气穴通道空气动力学 CFD 火箭工程

Synchrotron X-ray diagnostics of cutoff shape of nonthermal electron spectrum at young supernova remnants

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Research in Astronomy and Astrophysics 2014年第2期14卷 165-178页

作者： Ryo Yamazaki yutaka Ohira Makoto Sawada Aya Bamba Department of Physics and Mathematics Aoyama Gakuin University5-10-1 FuchinobeSagamihara 252-5258Japan

Synchrotron X-rays can be a useful tool to investigate electron accelera- tion at young supemova remnants （SNRs）. At present, since the magnetic field con- figuration around the shocks of SNRs is uncertain, it is not clear whether electron acceleration is limited by SNR age, synchrotron cooling, or even escape from the ac- celeration region. We study whether the acceleration mechanism can be constrained by the cutoff shape of the electron spectrum around the maximum energy. We derive analytical formulae of the cutoff shape in each case where the maximum electron en- ergy is determined by SNR age, synchrotron cooling and escape from the shock. They are related to the energy dependence of the electron diffusion coefficient. Next, we discuss whether information on the cutoff shape can be provided by observations in the near future which will simply give the photon indices and the flux ratios in the soft and hard X-ray bands. We find that if the power-law index of the electron spectrum is independently determined by other observations, then we can constrain the cutoff shape by comparing theoretical predictions of the photon indices and/or the flux ratios with observed data which will be measured by NuSTAR and/or ASTRO-H. Such study is helpful in understanding the acceleration mechanism. In particular, it will supply another independent constraint on the magnetic field strength around the shocks of SNRs.

关键词： acceleration of particles -- ISM: cosmic rays -- ISM: supernova rem-nants -- turbulence -- X-rays: ISM

Bandgap-tunable lateral and vertical heterostructures based on monolayer Mo1-xWxS2 alloys

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Nano Research 2015年第10期8卷 3261-3271页

作者： Yu Kobayashi Shohei Mori yutaka Maniwa Yasumitsu Miyata DepartmentofPhysics TokyoMetropolitanUniversityHachiojiTokyo192-0397Japan JST PRESTOKawaguchiSaitama332-0012Japan

有特定的 bandgaps 的二维的半导体的 heterostructures 的制造是认识到这些材料的完整的潜力在的一条重要途径电子并且 optoelectronic 设备。几个组最近基于象 WSe 2, MoSe 2, WS 2, 和瞬间 2 那样的典型半导体的转变金属 dichalcogen... 详细信息

有特定的 bandgaps 的二维的半导体的 heterostructures 的制造是认识到这些材料的完整的潜力在的一条重要途径电子并且 optoelectronic 设备。几个组最近基于象 WSe 2, MoSe 2, WS 2, 和瞬间 2 那样的典型半导体的转变金属 dichalcogenides (TMDC ) 的单层报导了侧面、垂直的 heterostructures 的直接生长。这里，我们基于 bandgap 悦耳的瞬间 1-x W x 由 WO 3 和哞 3 的有图案的薄电影的 sulfurization 的 S 2 合金单层。这些有图案的电影能够在水晶生长阶段期间由转变金属的散开产生许多集中坡度。在高温度下面，这导致瞬间 1-x W x 有各种各样的作文和 bandgaps 的 S 2 合金，在底层上取决于晶体的位置。这些合金的 Heterostructures 在低温度的生长期间在一个单个领域以内在 W/Mo 的比率通过逐步的变化被获得。单层瞬间 1-x W x S 2 合金，经常甚至在轻轻的条件下面降级，被涂层完成有另外的单层的合金。现在的调查结果表明学习并且优化基于 TMDC 的 heterostructures 的光、电的性质在未来设备应用允许材料的使用的一个有效工具。

关键词：半导体异质结构合金膜带隙单层可调光电子器件硫化物膜直接生长

Boundary-representable partition of unity for image magnification

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Science China(Information Sciences) 2013年第11期56卷 216-227页

作者： NAGAI Yukie OHTAKE yutaka YOKOTA Hideo SUZUKI Hiromasa School of Engineering The University of Tokyo153-8904 Japan Bio-Research Infrastructure Construction Team ASI RIKEN 351-0198 Japan RCAST The University of Tokyo153-8904 Japan

This paper proposes a simple yet efective algorithm to magnify 2D/3D images with preserving discontinuities of *** algorithm is based on the partition of unity(PU)approximation,which ofers many advantages such as smooth representation,noise-robustness,and precise ***,PU encounters difculties when scaling images and maintaining boundaries within images owing to the nature of its *** overcome this problem,we propose an approximation that preserves *** is realized by dividing the local spherical support of PU into two parts along a locally detected discontinuity and by individually approximating intensities on each side of the *** algorithm is suitable for magnifying a variety of images,including scanned documents,pictures,and CT-scanned *** demonstrate the efectiveness of the proposed method,we show some experimental results for 2D/3D images.

关键词： image approximation partition of unity piecewise smooth function volume data magnification

Context-sensitiveWeb service discovery over the bipartite graph model

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Frontiers of Computer Science 2013年第6期7卷 875-893页

作者： Rong ZHANG Koji ZETTSU yutaka KIDAWARA Yasushi KIYOKI Aoying ZHOU Software Engineering Institute East China Normal University National Institute of Information and Communications Technology Keio University

As service oriented architecture(SOA)matures,service consumption demand leads to an urgent requirement for service *** Web documents,services are intended to be executed to achieve objectives and/or desired goals of *** leads to the notion that service discovery should take the“usage context”of service into account as well as service content(descriptions)which have been well *** this paper,we introduce the concept of service context which is used to represent service *** query processing,both service content and service context are examined to identify *** propose to represent service context by a weighted bipartite graph *** on the bipartite graph model,we reduce the gap between query space and service space by query expansion to improve *** also design an iteration algorithm for result ranking by considering service context-usefulness as well as contentrelevance to improve ***,we develop a service search engine implementing this mechanism,and conduct some experiments to verify our idea.

关键词： Web service usage context bipartite graph model context-usefulness

Efficient gasification of wet biomass residue to produce middle caloric gas

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Particuology 2008年第5期6卷 376-382页

作者： Guangwen Xu Takahiro Murakami Toshiyuki Suda Hidehisa Tani yutaka Mito Research Laboratory IHI Co. Ltd. (IHI) Isogo-Ku Yokohama 235-8501 Japan State Key Laboratory of Multiphase Phase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China Energy Research Division Kobe steel Co. Ltd. Kobe Hyogo 651-2271 Japan

Various process residues represent a kind of biomass resource already concentrated but containing water as much as 60 wt.%. These materials are generally treated as waste or simply combusted directly to generate heat. Recently, we attempted to convert them into middle caloric gas to substitute for natural gas, as a chemical or a high-rank gaseous fuel for advanced combustion utilities. Such conversion is implemented through dual fluidized bed gasification （DFBG）. Concerning the high water content of the fuels, DFBG was suggested to accomplish either with high-efficiency fuel drying in advance or direct decoupling of fuel drying/pyrolysis from char gasification and tar/hydrocarbon reforming. Along with fuel drying, calcium-based catalyst can be impregnated into the fuel, without much additional cost, to increase the fuel＇s gasification reactivity and to reduce tar formation. This article reports the Ca impregnation method and its resulting effects on gasification reactivity and tar suppression ability. Meanwhile, the principle of directly gasifying wet fuel with decoupled dual fluidized bed gasification （D-DFBG） is also highlighted.

关键词： High-water content biomass Catalytic gasification Dual fluidized bed gasification Decoupled gasification Calcium

基于非线性反馈积分滑模控制的船舶航向自动舵设计

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中国航海 2022年第1期45卷 63-65,72页

作者：辛博鹏刘顺 yutaka WATANABE 大连海事大学航海学院辽宁大连116026 东京海洋大学海洋工学部东京135-8533

为设计一种节能并且鲁棒性强的船舶航向保持控制器,将非线性反馈算法与积分滑模控制相结合,设计非线性反馈积分滑模控制器用于船舶航向保持。非线性反馈积分滑模控制器建立在积分滑模控制器的基础上,利用非线性函数处理反馈误差,从而达... 详细信息

为设计一种节能并且鲁棒性强的船舶航向保持控制器,将非线性反馈算法与积分滑模控制相结合,设计非线性反馈积分滑模控制器用于船舶航向保持。非线性反馈积分滑模控制器建立在积分滑模控制器的基础上,利用非线性函数处理反馈误差,从而达到节能的作用。证明了积分滑模曲面的李雅普诺夫稳定性,并进行了仿真实验。从仿真结果可以看出,非线性反馈积分滑模控制在不影响航向保持精度的前提下,能够降低舵力,但是,船舶的横漂运动和转艏运动会受到影响。在设计非线性反馈积分滑模控制器的同时,分析了非线性反馈算法对船舶各状态的影响,对非线性反馈算法的进一步改进具有一定的参考价值。

关键词：积分滑模控制非线性反馈算法船舶航向自动舵舵机节能

Correlation between choroidal thickness and intraocular pressure after 23-gauge vitrectomy for idiopathic epiretinal membrane

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International Journal of Ophthalmology(English edition) 2018年第11期11卷 1774-1778页

作者： Masahiro Ishida Takashi Wakakuri yutaka Imamura Department of Ophthalmology Teikyo University School of Medicine University Hospital Mizonokuchi

AIM： To determine the relationship between the subfoveal choroidal thickness（CT） and intraocular pressure（IOP） following idiopathic epiretinal membrane（ERM） ***： Retrospective observational case series of patients who had undergone 23-gauge vitrectomy for an ERM. The measurements of CT and IOP were done at the baseline and 1 d, 1 wk, 1, 3, 6, and 12 mo after the ***： Forty-four eyes of 43 patients with a mean age of 69.8±9.5 y were studied. The CT was 200.8±86.3 μm at the baseline, 210.1±83.5 μm at 1 d, 213.2±85.4 μm at 1 wk, 203.1±84.0 μm at 1 mo, 197.5±85.5 μm at 3 mo, 197.7±84.0 μm at 6 mo, and 191.2±86.8 μm at 12 mo after surgery. The CT on day 1 and week 1 after the surgery was significantly thicker than that at the baseline CT（P=0.0023 and P〈0.0001）. The CT at 12 mo after surgery was significantly thinner than the baseline（P=0.0062）. The IOP on day 1 and week 1 were significantly lower than the baseline（P〈0.0001 and P=0.0042）. The IOP at 1, 3, 6, and 12 mo after surgery were significantly higher than the baseline IOP（P=0.0087, P=0.0023, P〈0.00051, and P〈0.0001）. The rates of changes in the CT between baseline and day 1 and week 1 were significantly and negatively correlated with the rates of change in the IOP（P〈0.0001 and P=0.046）. In the group with the IOP change rate of-30% or less at 1 d postoperatively, the change rate of CT was-21.1% to 31.2%（9.8%±12.4%） and in the group of-29% or more, it was-8.9% to 28.0%（2.6%±8.9%）. The change rate of CT in the group with the IOP change rate of-30% or less was significantly higher than the group of-29% or more（P=0.016）.CONCLUSION： CT increases soon after the ERM surgery which is probably due to the transient hypotony, showing that IOP may be a significant confounding factor for CT.

关键词： choroidal thickness vitrectomy intraocular pressure epiretinal membrane

Dynamic Force Reduction and Heat Transfer Improvement for Horizontal Tubes in Large-Particle Gas-Fluidized Beds

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Journal of Thermal Science 2008年第1期17卷 77-83页

作者： Yusumi Nagahashi John R.Grace Kok-Seng Lim yutaka Asako Dept.Mech.Eng. Kochi National College of Technol.KochiJAPAN Professor Dept.Chem.Biological Eng. The University of British ColumbiaVancouverCANADA CSIRO Minerals VictoriaAUSTRALIA Dept.Mech.Eng. Tokyo Metropolitan UniversityTokyoJAPAN

力量和热转移上的试管银行配置的效果为二维、三维的煤气的使流体化的床被调查。有效动态力量和热转移系数为几种试管银行配置被测量，并且平均力量比为一个单个试管小，这被发现。热转移系数能被提供足够的空间让粒子在试管银行的双方... 详细信息

力量和热转移上的试管银行配置的效果为二维、三维的煤气的使流体化的床被调查。有效动态力量和热转移系数为几种试管银行配置被测量，并且平均力量比为一个单个试管小，这被发现。热转移系数能被提供足够的空间让粒子在试管银行的双方附近下降增加。结果为优化试管银行的配置当由于动态力量减少试管侵蚀时，完成高热转移系数提供有用指南。

关键词：流化床热传输管状器具环流量