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Microstructure and Wear Behavior of Cermet/Iron Alloy Cladding Layers on A6061 Alloy Coated by Resistance Seam Welding Method

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Acta Metallurgica Sinica(English Letters) 2015年第4期28卷 414-423页

作者： Wen-Qin Wang Tomiko Yamaguchi Kazumasa nishio Faculty of Engineering Kyushu Institute of Technology Nishinippon Institute of Technology

Cermet/iron alloy cladding layers were coated on the surface of Al-Mg-Si alloy （A6061） plates by resistance seam welding method with tungsten carbide （WC） and high-carbon iron alloy （SHA） powders. The cladding layer consisted of WC reinforcement, SHA binder, A6061 and FeAl3. The effect of WC ratio （30 wt%, 50 wt% and 70 wt%） on the microstructure and wear behavior of the cladding layers was investigated in detail. Abrasive wear test was performed under two kinds of load condition by using a rubber wheel apparatus to evaluate wear resistance. The results showed that the wear resistance of the cladding layer was improved by 3.5-5 times than that of the substrate. At lower load, the wear resistances of the samples 30% and 70% WC were nearly the same, which suggested that FeAl3 played an important role in improvement of the wear resistance instead of WC. While at higher load, the amount of WC determined the wear resistance of the cladding layer. Furthermore, wear behavior of these cladding layers was explained with reference to the observed microstructure of the worn surface.

关键词： Resistance seam welding A6061 WC Cladding layer Wear resistance

Optimal calibration scheme for map-based control of diesel engines

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Science China(Information Sciences) 2018年第7期61卷 68-81页

作者： Yui nishio Yutaka MURATA Yukihisa YAMAYA Masato KIKUCHI Automobile R & D Center Honda R & D Co. Ltd.

Map-based control has the advantage of a simple control structure. However, in the case of a complex plant, calibrating the map is difficult. Calibration methodology using plant model is increasing in engine calibration industries. However, the models are for steady-state operation and cannot simulate at transient operation well. This study introduces the dynamic empirical model and applies the transient corrective function of an electronic control unit to simulate more realistic behavior. The optimization problem for calibrating maps of diesel engines is constructed, and the formulation of cost function and constraints is discussed. Consequently, the proposed calibration scheme can find an optimal map in satisfied ***, the optimized maps are validated using mass production diesel engines.

关键词： optimization Gaussian SQP Diesel engine calibration DoE

Commonalities and differences between Brassica and Arabidopsis self-incompatibility

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Horticulture Research 2014年第1期1卷 40-44页

作者： Masaya Yamamoto Takeshi nishio Graduate School of Agricultural Science Tohoku UniversitySendai 981-8555Japan

In higher plants,the self-incompatibility mechanism is important for inhibition of self-fertilization and facilitation of *** Brassicaceae,the self-incompatibility response is mediated by allele-specific interaction of the stigma-localized S-locus receptor kinase(SRK)with the pollen coat-localized ligand(SCR/SP11).All self-incompatible Brassicaceae plants analyzed have been found to have the SRK and SCR/SP11 genes in the S-locus *** Arabidopsis thaliana is self-compatible,transformation with functional SRK-SCR genes from self-incompatible Arabidopsis species confers the self-incompatibility phenotype to *** allele-specific interaction between SRK and SCR activates the downstream signaling cascade of *** two-hybrid analysis with a kinase domain of SRK as bait and genetic analysis suggested several candidate components of self-incompatibility signaling in ***,*** genes orthologous to the identified genes for Brassica self-incompatibility signaling were evaluated by using a self-incompatible transgenic *** plant and these orthologous genes were found not to be involved in self-incompatibility signaling in the transgenic *** this review,we describe common and different aspects of S-locus genomic regions and self-incompatibility signaling between Brassica and Arabidopsis.

关键词： Arabidopsis interaction analysis

Improvement of aerodynamic stability of suspension bridges with H-shaped simplified stiffening girder

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Frontiers of Structural and Civil Engineering 2016年第1期10卷 93-102页

作者： Hiroshi KATSUCHI Hitoshi YAMADA Mayuko nishio Yoko OKAZAKI Department of Civil Engineering Yokohama National University Yokohama 240-8501 Japan

Wind-tunnel study on the improvement of aerodynamic stability of simplified suspension-bridge girder structures was conducted with using a 1/40-scaled section model. Objective of the study is the development of an economically superior suspension bridge with 500-1,000 m center span length. The wind-tunnel test showed that an edge-girder type cross section exhibited large amplitude torsional vortex-induced vibration as well as torsional flutter at a low wind speed. Accordingly, aerodynamic countermeasures of open grating deck and triangular fating, and structural countermeasures of center stay, diagonal bracing and mass increase were tried to improve the aerodynamic stability. Finally, feasibility of the best combination to a full-scale bridge was examined by structural analysis.

关键词： suspension bridge aerodynamics simplified girder wind-tunnel test

Research on High Pressure Gas Injection As a Method of Fueling, Disruption Mitigation and Plasma Termination for Future Tokamak Reactors

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Plasma Science and Technology 2005年第5期7卷 3057-3061页

作者：宋云涛 S.nishio Institute of Plasma Physics Chinese Academy of Sciences Department of Fusion Plasma Research of Japan Atomic Energy Research InstituteNaka-machi Naka-gun Ibaraki-ken 311-0193 Japan

High-pressure gas injection has proved to be an effective disruption mitigation tech- nique in DIII-D tokamak experiments. If the method can be applied in future tokamak reactors not only for disruption mitigation but also for plasma termination and fueling, it will have an attractive advantage over the pellet and liquid injection from the viewpoint of economy and engineering design. In order to investigate the feasibility of this option, a study has been carried out with relevant parameters for conveying tubes of different geometrical sizes and for different gases. These parameters include pressure drop, lagger time after the valve＇s opening, gas diffusion in an ultra-high vacuum condition, and particle number contour.

关键词： tokamak reactor disruption mitigation fueling gas injection

Buckling Analysis of TF Coil Inner Leg for Central Solenoidless Tokamak

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Plasma Science and Technology 2006年第4期8卷 468-472页

作者：宋云涛杨庆喜 Satoshi nishio Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China Department of Fusion Plasma Research Japan Atomic Energy Research InstituteNaka-machiNaka-gunIbaraki-ken 311-0193Japan

The central post is one of the critical components for the low aspect ratio tokamak, which endures not only a tremendous ohmic heating because it carries a rather high current, but also a large neutron heating and irradiation owing to the plasma operation. The DS copper alloy Glidcop AL-25[8] was chosen as the conductor material for its adequate mechanical properties and physics properties. The central post has a cylindrical structure with lots of cooling channels. The length of the central post for the next generation of nuclear fusion spherical tokamaks will be more than 10 m or 20 m. The structural stability is very crucial. When the applied load is larger than the structure critical buckling load, the device will lose its stability and collapse. In order to calculate the critical buckling load, a 1/6-segment finite element model was used and the force acting on the central post was simulated. The results showed that the vertical compressive stresses mainly affect the stability of the central post. The linear buckling analysis results with finite element method based on small deformation theory were given in this paper. The relation curves and functions for buckling factor, depending on the different lengths and the radius of the central post, the diameter of cooling channel and the maximum allowable current density, were also shown.

关键词： low aspect ratio tokamak toroidal field coil central post buckling analysis

A wind tunnel study on control methods for cable dry-galloping

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Frontiers of Structural and Civil Engineering 2016年第1期10卷 72-80页

作者： Hung D. VO Hiroshi KATSUCHI Hitoshi YAMADA Mayuko nishio Department of Civil Engineering Yokohama National University Yokohama 240-8501 Japan

The common vibration of cable caused by rain-wind combination has been known as most typical type and a lot kind of its countermeasures has been proposed for suppressing this phenomenon. Recently, stayed-cables were also proved that they could be excited in dry state （without rain）, which is called dry-galloping. Recently, its mechanisms have been explained by axial flow, Reynolds number and so on. To clarify the characteristics of this galloping, wind tunnel test of a cable model with various kinds of wind angle was conducted. Then, three types of countermeasure were examined to suppress dry- galloping of bridge cable. The tests confirmed that the occurrence of dry-galloping depends on relative wind attacked angles and onset reduced wind speed. Furthermore, single spiral wire, double spiral wire and circular ring were found to have high effectiveness in mitigating this galloping when those are installed properly.

关键词： dry-galloping wind-relative angle single spiral wire double spiral wire circular rings

CNN-based segmentation frameworks for structural component and earthquake damage determinations using UAV images

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Earthquake Engineering and Engineering Vibration 2023年第2期22卷 359-369页

作者： Taisei Saida Muhammad Rashid Yudai Nemoto Shota Tsukamoto Takehiko Asai Mayuko nishio Graduate School of Science and Technology University of TsukubaTsukubaJapan Faculty of Engineering Information and SystemsUniversity of TsukubaTsukubaJapan

Buildings undergo various kinds of structural damage during earthquakes,and damage detection and functional assessment of these structures in the aftermath of the events have been challenging *** these circumstances,computer vision techniques offer a promising solution by automating the inspection *** study presents an effective methodology for automatic structural components and damage detection using unmanned aerial vehicle(UAV)images of damaged *** types of neural network architectures are considered for appropriate feature extractions in different task *** feature pyramid network(FPN)is employed for crack,spall,rebar,and component damage segmentation,while the UNet++network is utilized for the damage *** network training and validation,a total of 3805 original images of size 1920×1080 pixels are processed by the proposed method and reduced the image *** the FPN,the achieved highest intersection over unions(IoUs)were 0.59,0.93,0.42,and 0.99 for crack,spall,rebar,and components,*** predicted labels were found in close agreement with the ***,the UNet++recognized the semantic information and damage state with an IoU of *** demonstrated the applicability of the proposed method for automated post-earthquake building inspection process accurately without information loss from the original images.

关键词： computer vision semantic segmentation component segmentation damage evaluation FPN UNet++

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SiC/SiC复合材料第一壁热工设计

核聚变与等离子体物理 2003年第1期23卷 25-30页

作者：何开辉 Satoshi nishio 核工业西南物理研究院成都610041 日本原子力研究所那珂研究所

以日本原子力研究所那珂研究所聚变堆设计室进行的先进稳态托卡马克聚变堆2(A SSTR2)概念设计为基础,对SiC SiC复合材料包层第一壁热工设计进行了分析计算。通过选取各种几何位形和材料敏感特性参数,用有限元法进行了大量的热工计算,... 详细信息

以日本原子力研究所那珂研究所聚变堆设计室进行的先进稳态托卡马克聚变堆2(A SSTR2)概念设计为基础,对SiC SiC复合材料包层第一壁热工设计进行了分析计算。通过选取各种几何位形和材料敏感特性参数,用有限元法进行了大量的热工计算,以最高温度、最大热应力为基础建立了包层第一壁设计窗口,选取了满足热工要求的最佳设计方案,对今后的工程设计具有指导作用和重要的参考价值。

关键词：第一壁热工设计 SiC/SiC复合材料 A-SSTR2 设计窗口托卡马克聚变堆