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Science China(Technological Sciences) 2010年第1期53卷 93-99页

作者： Kai SHIMOKAWA Akinori FURUKAWA Kusuo OKUMA Daisuke MATSUSHITA satoshi WATANABE Graduate School of Engineering Kyushu UniversityMotooka 744Nishi-kuFukuoka819-0395Japan Department of Mechanical Engineering Kyushu UniversityMotooka 744Nishi-kuFukuoka819-0395Japan

A ducted Darrieus-type turbine has been proposed for hydropower utilization of extra-low head less than 2 *** the hydro turbine system,in general,might consist of an intake,runner casing section and a draft tube for higher efficiency operation,it was clarified in previous experiment that there was no need of the side-walls of runner casing section and a draft-tube for keeping the efficiency high in the case of duct with an inlet *** would yield a simplification of the structure of the turbine *** order to reconfirm this result for large-sized turbine with 560 mm×300 mm duct,instead of small-sized one with 400 mm×200 mm duct,the side-wall effect on turbine performance was experimentally investigated for three-or four-bladed *** the present paper,the experimental results are shown with considering flow behaviors in the runner section.

关键词： hydro turbine Darrieus-type runner duct side-wall effect turbine performance

Simultaneous removal of dissolved organic matter and bromide from drinking water source by anion exchange resins for controlling disinfection by-products

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Journal of Environmental Sciences 2014年第6期26卷 1294-1300页

作者： Athit Phetrak Jenyuk Lohwacharin Hiroshi Sakai Michio Murakami Kumiko Oguma satoshi Takizawa Department of Urban Engineering Graduate School of Engineering The University of Tokyo Institute of Industrial Science The University of Tokyo

Anion exchange resins （AERs） with different properties were evaluated for their ability to remove dissolved organic matter （DOM） and bromide, and to reduce disinfection by-product （DBP） formation potentials of water collected from a eutrophic surface water source in Japan. DOM and bromide were simultaneously removed by all selected AERs in batch adsorption experiments. A polyacrylic magnetic ion exchange resin （MIEX） showed faster dissolved organic carbon （DOC） removal than other AERs because it had the smallest resin bead size. Aromatic DOM fractions with molecular weight larger than 1600 Da and fluorescent organic fractions of fulvic acid- and humic acid-like compounds were efficiently removed by all AERs. Polystyrene AERs were more effective in bromide removal than polyacrylic AERs. This result implied that the properties of AERs, i.e. material and resin size, influenced not only DOM removal but also bromide removal efficiency, MIEX showed significant chlorinated DBP removal because it had the highest DOC removal within 30 rain, whereas polystyrene AERs efficiently removed brominated DBPs, especially brominated trihalomethane species. The results suggested that, depending on source water DOM and bromide concentration, selecting a suitable AER is a key factor in effective control of chlorinated and brominated DBPs in drinking water.

关键词： adsorption dissolved organic carbon drinking water treatment ion exchange

Structural and optical properties of nanostructured copper sulfide semiconductor synthesized in an industrial mill

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Frontiers of Chemical Science and Engineering 2019年第1期13卷 164-170页

作者： Marcela Achimovicova Erika Dutkova Erika Tothova Zdenka Bujnakova Jaroslav Briancin satoshi Kitazono Institute of Mineral and Waste Processing Waste Disposal and Geomechanics Clausthal University of Technology Clausthal 38678 Germany Institute of Geotechnics Slovak Academy of Sciences Kosice 04001 Slovakia Nakase Refinery Nihon Seiko Co. Ltd. Yabu-shi Hyogo 667-1111 Japan

Chalcogenide nanostructured semiconductor, copper sulfide (CuS) was prepared from copper and sulfur powders in stoichiometric ratio by a simple, fast, and convenient one-step mechanochemical synthesis after 40 min of milling in an industrial eccentric vibratory mill. The kinetics of the mechanochemical synthesis and the influence of the physical properties of two Cu powder precursor types on the kinetics were studied. The crystal structure, physical properties, and morphology of the product were characterized by X-ray diffraction (XRD), the specific surface area measurements, particle size distribution and scanning electron microscopy. The XRD analysis confirmed the hexagonal crystal structure of the product-CuS (covellite) with the average size of the crystallites 11 nm. The scanning electron microscopy analysis has revealed that the agglomerated grains have a plate-like structure composed of CuS nanoparticles. The thermal analysis was performed to investigate the thermal stability of the mechanochemically synthesized CuS. The optical properties were studied using UV-Vis and photoluminescence spectroscopy. The determined optical band gap energy 1.80 eV responds to the value of the bulk CuS, because of agglomerated nanoparticles. In addition, a mechanism of CuS mechanochemical reaction was proposed, and the verification of CuS commercial production was performed.

关键词： copper sulfide industrial mechanochemical synthesis thermal analysis optical properties

Thermal cycling creep properties of a directionally solidified superalloy DZ125

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Journal of Materials Science & Technology 2022年第9期104卷 269-284页

作者： Wenrui An satoshi Utada Xiaotong Guo Stoichko Antonov Weiwei Zheng Jonathan Cormier Qiang Feng Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Institut Pprime UPR CNRS 3346Department of Physics and Mechanics of MaterialsISAE-ENSMABP4010986961 Futuroscope Chasseneuil CedexFrance China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou 510610China Department of Microstructure Physics and Alloy Design Max-Planck-Institut für Eisenforschung GmbHDüsseldorf 40237Germany

Aero-engine turbine blades may suffer overheating during service,which can result in severe microstructural and mechanical degradation within tens of *** this study,the thermal cycling creep under(950℃/15 min+1100℃/1 min)-100 MPa was performed on a directionally solidified superalloy,*** effects of overheating and thermal cycling on the creep properties were evaluated in terms of creep behavior and microstructural evolution against isothermally crept specimens under 950℃/100 MPa,950℃/270 MPa,and 1100℃/100 *** results indicated that the thermal cycling creep life was reduced dramatically compared to the isothermal creep under 950℃/100 *** plastic creep deformation mainly occurred during the overheating stage during the thermal cycling *** thermal cycling creep curve exhibited three stages,similar to the 1100℃isothermal creep,but its minimum creep rate occurred at a lower creep *** overheating events caused severe microstructural degradation,such as substantial dissolution ofγ'phase,earlier formation of raftedγ'microstructure,widening of theγchannels,and instability of the interfacial dislocation *** microstructural degradation was the main reason for the dramatic decrease in thermal cycling creep life,as the thermal cycling promoted more dislocations to cut intoγ'phase and more cracks to initiate at grain boundaries,carbides,and residual eutectic *** study underlines the importance of evaluating the thermal cycling creep properties of superalloys to be used as turbine blades and provides insights into the effect of thermal cycling on directionally solidified superalloys for component design.

关键词： Directional solidified superalloy Thermal cycling creep Overheating Creep properties Microstructural degradation

Preservation and management of a World Heritage site Tajima Yahei Sericulture Farm and its buffer zone

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Built Heritage 2020年第3期4卷 1-17页

作者： Sweet Yee Cheng satoshi Ono Graduate School of Urban Innovation Yokohama National University79-5 TokiwadaiHodogaya WardYokohamaKanagawa 240-8501Japan

Tajima Yahei Sericulture Farm,one of the four components of the UNESCO World Heritage Site Tomioka Silk Mill and Related Sites inscribed in 2014,was the starting point for advancements in sericulture farmhouses,emphasizing the importance of *** Yahei’s experimentation surrounding the ideal space to breed silkworms,a new sericulture theory was invented,and a sericulture farmhouse architecture was *** the purpose of preserving this cultural heritage for future generations,it is important to understand the idea that led to the cultural and industrial advancement of the village of Shimamura and to revise the preservation plans prepared by *** paper will discuss the development of the sericulture theory,seiryō-iku theory,and the formation of a sericulture farmhouse architecture;describe the adaptation of former sericulture farmhouses and the surrounding landscapes in terms of the industry and environment;outline the plans and efforts for the preservation and revitalization of Tajima Yahei Sericulture Farm,its surrounding area and its underlying issues;and propose a direction for future preservation plans.

关键词： Preservation Revitalization Theory Management Planning Sericulture UNESCO world heritage Heritage buildings

Vitreous hemorrhage and fibrovascular proliferation after laser-induced chorioretinal venous anastomosis

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International Journal of Ophthalmology(English edition) 2011年第2期4卷 216-217页

作者： Tomoyasu Shiraya satoshi Kato Takashi Shigeeda Harumi Fukushima Department of Ophthalmology University of Tokyo Graduate School of Medicine

·AIM:To describe a case in which vitrectomy was required for vitreous hemorrhage and fibrovascular proliferation after laser-induced chorioretinal venous anastomosis (LCVA) for non-ischemic central retinal vein occlusion (CRVO).·METHODS:Observational case report.·RESULTS:A 72-year-old man complained of central scotoma in the left eye,and was diagnosed as suffering from non-ischemic *** was performed in another *** favorable visual function was briefly maintained postoperatively,severe vitreous hemorrhage developed in his left eye,necessitating vitrectomy.·CONCLUSION:Considering that LCVA carries a risk of serious complications,we must apply this treatment with caution,especially in ethnic groups,such as the Japanese,in whom pigmentation reacts to photocoagulation excessively.·

关键词： vitreous hemorrhage fibrovascular proliferation laser-induced chorioretinal venous anastomosis non-ischemic central retinal vein occlusion

Effects of scallop shell extract on scopolamine-induced memory impairment and MK801-induced locomotor activity

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Asian Pacific Journal of Tropical Medicine 2016年第7期9卷 643-647页

作者： Yasushi Hasegawa Tatsuro Inoue satoshi Kawaminami Miho Fujita College of Environmental Technology Muroran Institute of Technology

Objective:To evaluate the neuroprotective effects of the organic components of scallop shells(scallop shell extract) on memory impairment and locomotor activity induced by scopolamine or 5-methyl-10,11-dihydro-5H-dibenzo(a,d) cyclohepten-5,10-imine(MK801).Methods:Effect of the scallop shell extract on memory impairment and locomotor activity was investigated using the Y-maze test,the Morris water maze test,and the open field ***:Scallop shell extract significantly reduced scopolamine-induced short-term memory impairment and partially reduced scopolamine-induced spatial memory impairment in the Morris water maze *** shell extract suppressed scopolamine-induced elevation of acetylcholine esterase activity in the cerebral *** with scallop shell extract reversed the increase in locomotor activity induced by *** shell extract also suppressed the increase in locomotor activity induced by ***:Our results provide initial evidence that scallop shell extract reduces scopolamine-induced memory impairment and suppresses MK-801-induced hyperlocomotion.

关键词： Locomotor activity Memory impairment Scallop shell Schizophrenia

Early serum albumin changes in patients with ulcerative colitis treated with tacrolimus will predict clinical outcome

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World Journal of Gastroenterology 2021年第22期27卷 3109-3120页

作者： Natsuki Ishida Takahiro Miyazu satoshi Tamura Shinya Tani Mihoko Yamade Moriya Iwaizumi Yasushi Hamaya satoshi Osawa Takahisa Furuta Ken Sugimoto First Department of Medicine Hamamatsu University of School of MedicineHamamatsu 431-3192Japan Department of Laboratory Medicine Hamamatsu University of School of MedicineHamamatsu 431-3192Japan Department of Endoscopic and Photodynamic Medicine Hamamatsu University of School of MedicineHamamatsu 431-3192Japan Center for Clinical Research Hamamatsu University of School of MedicineHamamatsu 43131Japan

BACKGROUND Oral tacrolimus is a therapeutic agent for moderate to severe steroid-dependent or resistant ulcerative colitis(UC),but remission induction is difficult,and it is necessary to treat the patient while considering the next *** To examine serum albumin(Alb)level as a prognostic factor for the therapeutic effect of tacrolimus in clinical *** Forty-seven patients with UC treated with tacrolimus at our institution were divided into remission and failure groups(colectomy or switch to biologics),and the biological data at the start of observation and at weeks 1 and 2 were retrospectively ***-Meier and multivariate analyses were performed using Alb as a prognostic factor in UC *** During the three months observed,17(36.2%)patients failed treatment with tacrolimus.A comparison between the failure and remission groups showed a significant difference only in Alb in week 2,and in the week 2/week 0 Alb ratio,which showed the rate of change in *** cut-off value of the week 2/week 0 Alb ratio that predicted failure was 1,and its area under the curve was 0.751(95%CI:0.604-0.898).In the Kaplan-Meier analysis,a week 2/week 0 Alb ratio≤1 had a significantly higher failure rate than that of>1;Cox proportional hazard regression analysis also showed that a week 2/week 0 Alb ratio≤1 was an independent prognostic factor for failure within 3 mo after the start of tacrolimus *** A week 2/week 0 Alb ratio≤1 predicts failure within 3 mo of tacrolimus administration for *** failure risk exists with week 2 Alb values≤1 on admission.

关键词： Ulcerative colitis Tacrolimus Albumin

Microstructural evolution and mechanical properties of a low-carbon quenching and partitioning steel after partial and full austenitization

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International Journal of Minerals,Metallurgy and Materials 2016年第8期23卷 906-919页

作者： Wan-song Li Hong-ye Gao Hideharu Nakashima satoshi Hata Wen-huai Tian School of Materials Science and Engineering University of Science and Technology Beijing Interdisciplinary Graduate School of Engineering Sciences Kyushu University

In this work, low-carbon steel specimens were subjected to the quenching and partitioning process after being partially or fully austenitized to investigate their microstructural evolution and mechanical properties. According to the results of scanning electron microscopy and transmission electron microscopy observations, X-ray diffraction analysis, and tensile tests, upper bainite or tempered martensite appears successively in the microstructure with increasing austenitization temperature or increasing partitioning time. In the partially austenitized specimens, the retained austenite grains are carbon-enriched twice during the heat treatment, which can significantly stabilize the phases at room temperature. Furthermore, after partial austenitization, the specimen exhibits excellent elongation, with a maximum elongation of 37.1%. By contrast, after full austenitization, the specimens exhibit good ultimate tensile strength and high yield strength. In the case of a specimen with a yield strength of 969 MPa, the maximum value of the ultimate tensile strength reaches 1222 MPa. During the partitioning process, carbon partitioning and carbon homogenization within austenite affect interface migration. In addition, the volume fraction and grain size of retained austenite observed in the final microstructure will also be affected.

关键词： low-carbon steel quenching partitioning microstructure mechanical properties interfaces

Port-resolving,tsunami,and tidal simulations to locate“tsunami vortexes”for safe vessel evacuation planning

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International Journal of Modeling, Simulation, and Scientific Computing 2018年第3期9卷 93-106页

作者： satoshi Nakada Mitsuru Hayashi Shunichi Koshimura Ei-ichi Kobayashi Graduate School of Maritime Sciences Kobe UniversityJapan Research Centre for Inland Seas Kobe UniversityJapan International Research Institute of Disaster Science Tohoku University Japan

Vortexes induced by tsunamis,“tsunami vortexes”,pose a potential danger for ship evacuation,and their prediction is important to determine their role in navigation and safe vessel *** study simulated tsunami-induced vortexes in Osaka Bay and investigated their spatial and temporal scales using a port-resolved,high-resolution tsunami model based on a scenario for the largest tsunamigenic earthquake expected to occur along the Nankai Trough in the near *** induced by tidal currents were also evaluated using a realistic tidal simulation for comparison with the magnitudes of the tsunami *** tsunami simulation identified the dominant areas of the tsunami vortexes characterized by the magnitude of the *** maps of tsunami speeds and vortexes showed the difficult areas for ship evacuation and indicated that these areas can persist after the approach of the leading wave around the entrances to port *** areas of tsunami vortex formation were largely deduced by analyzing the vorticity fields in the tidal simulations,because the magnitude of tsunami-induced vorticities was closely correlated with that of the tide-induced *** combination of tide and tsunami simulations can identify areas of tsunami vortex formation and provide valuable information to guide measures for safer vessel evacuation.

关键词： Giant tsunami vortex tsunami simulation tidal current Nankai Trough vessel evacuation.