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Journal of Mountain Science 2016年第2期13卷 193-202页

作者： Kana NAKATANI satoshi HAYAMI Yoshifumi SATOFUKA Takahisa MIZUYAMA Department of Erosion Control Engineering Kyoto University Kyoto 606-8502 Japan CTI Engineering Co. Ltd. Osaka 541-0045 Japan Department of Civil Engineering Ritsumeikan University Shiga 606-8502 Japan National Graduate Institute for Policy Studies Tokyo106-8677 Japan

This paper presents debris-flow numerical simulations using the Hyper KANAKO system,developed by the *** system uses the debris flow simulator KANAKO 2D equipped with a graphical user interface(GUI);hence,a user can easily produce appropriate landform data for simulations using standard laser profiler data,and visualize the results using a *** KANAKO was applied to the streams around Kiyomizu-dera in Kyoto,***-dera is a famous temple in Japan which is visited by numerous tourists throughout the *** simulated a disaster scenario of debris flow caused by torrential *** set the hydrograph using rainfall intensity data,and set the landform data using information from the Geospatial Information Authority of Japan(GSI) and a digital elevation model(DEM).We evaluated different mesh sizes and also used a digital surface model(DSM) to consider the building *** simulation results showed that with small mesh size,the debris flowmoved through the roads,which seems realistic for a disaster *** buildings were considered,the flow direction changed,and a 1-m flow depth,which was deeper than in other cases,appeared in the flow *** may pose a dangerous situation for evacuations.

关键词：泥石流灾害子系统日本清水暴雨京都图形用户界面地理空间信息

Self-adjustment of a nonlinear lasing mode to a pumped area in a two-dimensional microcavity [Invited]

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Photonics Research 2017年第6期5卷 49-55页

作者： YUTA KAWASHIMA SUSUMU SHINOHARA satoshi SUNADA TAKAHISA HARAYAMA Department of Applied Physics School of Advanced Science and Engineering Waseda University Faculty of Mechanical Engineering Institute of Science and Engineering Kanazawa University

We numerically performed wave dynamical simulations based on the Maxwell–Bloch(MB) model for a quadrupole-deformed microcavity laser with spatially selective pumping. We demonstrate the appearance of an asymmetric lasing mode whose spatial pattern violates both the x-and y-axes mirror symmetries of the *** simulations revealed that a lasing mode consisting of a clockwise or counterclockwise rotating-wave component is a stable stationary solution of the MB model. From the results of a passive-cavity mode analysis, we interpret these asymmetric rotating-wave lasing modes by the locking of four nearly degenerate passive-cavity modes. For comparison, we carried out simulations for a uniform pumping case and found a different locking rule for the nearly degenerate modes. Our results demonstrate a nonlinear dynamical mechanism for theformation of a lasing mode that adjusts its pattern to a pumped area.

关键词： Self-adjustment of a nonlinear lasing mode to a pumped area in a two-dimensional microcavity

A Feasibility Study of Power Generation from Sewage Using a Hollowed Pico-Hydraulic Turbine

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Engineering 2016年第4期2卷 510-517页

作者： Tomomi Uchiyama satoshi Honda Tomoko Okayama Tomohiro Degawa Institute of Materials and Systems for Sustainability Nagoya University Nagoya 464-8603 Japan Graduate School oflnformation Science Nagoya University Nagoya 464-8601Japan Faculty of Human Studies Taisho University Tokyo 170-8470 Japan

本文利用微型水轮机技术,着重对污水管道水力发电的可行性进行了研究。首先,对日本丰川河流域排水系统两连接点处的污水流量进行了一年以上的观测,借此分析污水的水力势能;其次,假定微型水轮机被安装在污水管道的连接点位置,通过实验室... 详细信息

本文利用微型水轮机技术,着重对污水管道水力发电的可行性进行了研究。首先,对日本丰川河流域排水系统两连接点处的污水流量进行了一年以上的观测,借此分析污水的水力势能;其次,假定微型水轮机被安装在污水管道的连接点位置,通过实验室试验研究微型水轮机的性能。研究表明:污水管道的连接点处蕴藏有可用于全年发电的水力势能,同时,微型水轮机在该位置可以有效地进行污水水力发电。

关键词：微型水轮机发电污水流量镂空水采水力能源实验室实验连接点

Degradation of Reactive Yellow 86 with photo-Fenton process driven by solar light

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Journal of Environmental Sciences 2010年第9期22卷 1455-1461页

作者： Hideyuki Katsumata Syunya Koike satoshi Kaneco Tohru Suzuki Kiyohisa Ohta Department of Chemistry for Materials Graduate School of EngineeringMie UniversityTsu Environmental Preservation Center Mie UniversityTsu

The decolorization of Reactive Yellow 86 （RY 86）, one of reactive azo dyes, was investigated in the presence of Fenton reagent under solar light irradiation. The decolorization rate was strongly influenced by pH, initial concentrations of H202 and Fe（II）, and so on. An initial concentration of 40 mg/L was decolored more than 90% after 20 min under optimum conditions. The activation energy of the solar photo-Fenton reaction was 1.50 kJ/mol for RY 86 in the temperature range of 10-60℃. In the kinetic study, the rate constant of RY 86 with OH- radicals could be estimated to be 1.7 × 10^10 L/（***）. The decolorization efficiency of RY 86 under solar light irradiation was comparable to the artificial light irradiation. The decrease of TOC as a result of mineralization of RY 86 was observed during photo-Fenton process. The rate of RY 86 mineralization was about 83% under UV irradiation after 24 hr. The formation of chloride, sulfate, nitrate and ammonium ions as end-products was observed during the photocatalytic process. The decomposition of RY 86 gave two kinds of intermediate products. The degradation mechanism of RY 86 was proposed on the base of the identified intermediates.

关键词： reactive azo dye photo-Fenton reaction solar light irradiation decolorization mineralization

Use of Asian selected agricultural byproducts to modulate rumen microbes and fermentation

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Journal of Animal Science and Biotechnology 2017年第2期8卷 317-326页

作者： Yasuo Kobayashi Seongjin Oh Htun Myint satoshi Koike Lab of Animal Function and Nutrition Research Faculty of AgricultureHokkaido UniversitySapporo 060-8589 Japan

In the last five decades, attempts have been made to improve rumen fermentation and host animal nutrition through modulation of rumen microbiota. The goals have been decreasing methane production, partially inhibiting protein degradation to avoid excess release of ammonia, and activation of fiber digestion. The main approach has been the use of dietary supplements. Since growth-promoting antibiotics were banned in European countries in2006, safer alternatives including plant-derived materials have been explored. Plant oils, their component fatty acids,plant secondary metabolites and other compounds have been studied, and many originate or are abundantly available in Asia as agricultural byproducts. In this review, the potency of selected byproducts in inhibition of methane production and protein degradation, and in stimulation of fiber degradation was described in relation to their modes of action. In particular, cashew and ginkgo byproducts containing alkylphenols to mitigate methane emission and bean husks as a source of functional fiber to boost the number of fiber-degrading bacteria were highlighted. Other byproducts influencing rumen microbiota and fermentation profile were also described. Future application of these feed and additive candidates is very dependent on a sufficient, cost-effective supply and optimal usage in feeding practice.

关键词： Agricultural byproduct Fermentation Fiber degradation Methane mitigation Microbiota Plant secondary metabolites Rumen

Fabrication of Co2Fe（Al,Si） and Co2Fe（Al,Si）/MgO on Ge（111） Substrate and Its Magnetic Properties

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Journal of Electronic Science and Technology 2019年第2期17卷 109-115页

作者： Kohei Kataoka Nobuki Tezuka Masashi Matsuura satoshi Sugimoto Graduate School of Engineering Tohoku University

We investigated the interfacial effects on magnetic properties in Co2Fe(Al,Si)/Ge (CFAS/Ge) and CFAS/MgO/Ge systems to demonstrate the effects of the interface structure on magnetic properties. CFAS and CFAS/MgO were deposited on the i-Ge(111) substrate. In-situ reflection high energy electron diffraction (RHEED) patterns showed epitaxially grown CFAS and MgO on Ge(111). According to the X-ray diffraction (XRD)φ-scan of CFAS(220), we determined that the crystallographic orientation relationships were CFAS(111)//Ge(111) and CFAS(111)//MgO(111) Ge(111). The magnetic properties were measured by the vibrating sample magnetometer (VSM) and the saturation magnetization Ms value of CFAS with 2-nm thick MgO reached the value of L21 ordered one. A uniaxial magnetic anisotropy behavior was observed both in CFAS/Ge and CFAS/MgO/Ge structures after annealing. We confirmed the behavior did not only originate from the CFAS/Ge interface but also CFAS/MgO and the ordering structure.

关键词： Co2Fe(Al,Si) full-heusler alloy magnetic anisotropy

Integrating GPS trajectory and topics from Twitter stream for human mobility estimation

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Frontiers of Computer Science 2019年第3期13卷 460-470页

作者： satoshi MIYAZAWA Xuan SONG Tianqi XIA Ryosuke SHIBASAKI Hodaka KANEDA Department of Socio-Cultural Environmental Studies Graduate School of Frontier Sciences The University of Tokyo Chiba 277-8563 Japan Center for Spatial Information Science The University of Tokyo Kashiwa 277-8568 Japan Zenrin DataCom Co. Ltd Tokyo 108-6206 Japan

Understanding urban dynamics and large-scale human mobility will play a vital role in building smart cities and sustainable urbanization. Existing research in this domain mainly focuses on a single data source (e.g., GPS data, CDR data, etc.). In this study, we collect big and heterogeneous data and aim to investigate and discover the relationship between spatiotemporal topics found in geo-tagged tweets and GPS traces from smartphones. We employ Latent Dirichlet Allocation-based topic modeling on geo-tagged tweets to extract and classify the topics. Then the extracted topics from tweets and temporal population distribution from GPS traces are jointly used to model urban dynamics and human crowd flow. The experimental results and validations demonstrate the efficiency of our approach and suggest that the fusion of cross-domain data for urban dynamics modeling is more practical than previously thought.

关键词： GPS trajectory human mobility SNS locationbased social network (LBSN) topic modeling data mining spatiotemporal topic

Experimental Analysis of Flow Structure in Contra-Rotating Axial Flow Pump Designed with Different Rotational Speed Concept

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Journal of Thermal Science 2013年第4期22卷 345-351页

作者： Linlin Cao satoshi Watanabe Toshiki Imanishi Hiroaki Yoshimura Akinori Furukawa Graduate School of Engineering Kyushu University Department of Mechanical Engineering Kyushu University Oita National College of Technology

As a high specific speed pump, the contra-rotating axial flow pump distinguishes itself in a rear rotor rotating in the opposite direction of the front rotor, which remarkably contributes to the energy conversion, the reduction of the pump size, better hydraulic and cavitation performances. However, with two rotors rotating reversely, the significant interaction between blade rows was observed in our prototype contra-rotating rotors, which highly affected the pump performance compared with the conventional axial flow pumps. Consequently, a new type of rear rotor was designed by the rotational speed optimization methodology with some additional considerations, aiming at better cavitation performance, the reduction of blade rows interaction and the secondary flow suppression. The new rear rotor showed a satisfactory performance at the design flow rate but an unfavorable positive slope of the head-flow rate curve in the partial flow rate range less than 40% of the design flow rate, which should be avoided for the reliability of pump-pipe systems. In the present research, to understand the internal flow field of new rear rotor and its relation to the performances at the partial flow rates, the velocity distributions at the inlets and outlets of the rotors are firstly investigated. Then, the boundary layer flows on rotor surfaces, which clearly reflect the secondary flow inside the rotors, are analyzed through the limiting streamline observations using the multi-color oil-film method. Finally, the unsteady numerical simulations are carried out to understand the complicated internal flow structures in the rotors.

关键词：旋转速度设计流量轴流泵实验分析流动结构转子结构非定常数值模拟汽蚀性能

Pressure Measurement on Casing Wall and Blade Rows Interaction of Contra-Rotating Axial Flow Pump

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Journal of Thermal Science 2005年第2期14卷 142-149页

作者： Toru SHIGEMITSU Tomoya TAKANO Akinori FURUKAWA Kusuo OKUMA satoshi WATANABE Division of Mechanical Engineering Science Kyushu University 6-10-1HakozakiHigashi-kuFukuoka 812-8581JapanDivision of Mechanical Engineering Science Kyushu University6-10-1HakozakiHigashi-kuFukuoka 812-8581JapanDivision of Mechanical Engineering Science Kyushu University6-10-1HakozakiHigashi-kuFukuoka 812-8581JapanDivision of Mechanical Engineering Science Kyushu University6-10-1HakozakiHigashi-kuFukuoka 812-8581JapanDivision of Mechanical Engineering Science Kyushu University6-10-1HakozakiHigashi-kuFukuoka 812-8581Japan

An application of contra-rotating rotors has been proposed against a demand for developing higher specific speed axial flow pump. The blade rows interaction between front and rear rotors should be clarified for its stable operation and reduction of unsteady losses. In this paper, the static pressure distributions on casing wall are provided by measuring with the phase locked sampling method. The measurements are carried out for two types of the rear rotors with different blade number and chord length, and it is found that, for both types of rotors, the unsteady pressure fluctuations are more remarkable in the front rotor than in the rear rotor and they are caused by the rear rotor pressure field. The effects of pressure fluctuations will be discussed in more details toward understanding the blade rows interaction in the contra-rotating axial flow pump.

关键词：涡轮机逆旋转转子压力场叶栅交感测量方法

Design of Photothermal Covalent Organic Frameworks by Radical Immobilization

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CCS Chemistry 2022年第8期4卷 2842-2853页

作者： Xiaohui Tang Zhongxin Chen Qing Xu Yan Su Hong Xu satoshi Horike Huanhuan Zhang Yuan Li Cheng Gu State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSouth China University of TechnologyGuangzhou 510640 CAS Key Laboratory of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research Institute(SARI)Chinese Academy of Sciences(CAS)Shanghai 201210 Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084 Institute for Integrated Cell-Material Sciences Institute for Advanced StudyKyoto UniversityYoshidaSakyo-kuKyoto 606-8501 Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of TechnologyGuangzhou 510640

Covalent organic frameworks(COFs)characterized by structural diversity,face-to-face stacking and open channels exhibit unique advantages as photothermal materials but have rarely been applied in solar-driven water evaporation due to complicated framework design,tedious synthesis,and low solar-to-vapor ***,we report a materials design strategy to produce efficient and robust photothermal COF by anchoring nonemissive radicals to the pore surface by a[2+2]cycloaddition–retroelectrocyclization reaction.

关键词： covalent organic frameworks radicals photothermal conversion water evaporation