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Microstructure of Co-Ni-Al2O3 Composite Coatings by Electroforming

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Journal of Materials Science & Technology 2003年第Z1期19卷 133-134页

作者： Gang WU Ning LI Derui ZHOU Kurachi mitsuo Dept. of Applied Chemistry Harbin Institute of Technology Harbin 150001 China1 Dept. of Applied Chemistry Harbin Institute of Technology Harbin 150001 China1 Dept. of Applied Chemistry Harbin Institute of Technology Harbin 150001 China1 Faculty of Engineering Kyoto University Kyoto 606-8283 Japan

The metal matrix composite coatings of Co-Ni-Al2O3 were studied by electrolytic codeposition of Co-Ni alloys and Al2O3 on a Cu substrate from a sulfamate electrolyte containing Al2O3 particles. It was illustrated from the examined results of SEM, AFM and XRD that surface morphology and microstructure of Co-Ni-Al2O3 coatings appear to be mainly influenced by variations in Co content. The high Co content coatings with hcp lattice structure have a more uniform and fine structure than that of low Co content coatings with fcc lattice structure. The codeposition of Al2O3 particles in Co-Ni alloys can not change the phase structure of solid solution, only affects the growth and orientation of crystal planes and mostly increase the d value of lattice.

关键词： Electroforming, Composite coatings, Cobalt-Ni alloys, Alumina

Research on Arterial Stiffness Status in Type 2 Diabetic Patients Based on Pulse Waveform Characteristics

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Computer Modeling in Engineering & Sciences 2018年第11期117卷 143-155页

作者： Gaoyang Li Xiaorui Song Aike Qiao Makoto ohta Graduate School of Biomedical Engineering Tohoku UniversitySendaiMiyagiJapan. Department of Radiology Taishan Medical UniversityNo.619 Greatwall RoadDaiyue DistrictTaianShandong271000China College of Life Science and Bioengineering Beijing University of TechnologyNo.100PingleyuanChaoyang DistrictBeijing100022China Institute of Fluid Science Tohoku UniversitySendai980-8577MiyagiJapan ELyTMaX UMI 3757 CNRS-Universitéde Lyon-Tohoku UniversityJapan

For patients with type 2 diabetes,the evaluation of pulse waveform characteristics is helpful to understand changes in arterial ***,there is a lack of comprehensive analysis of pulse waveform ***,we aimed to investigate the changes in pulse waveform characteristics in patients with type 2 diabetes due to increased arterial *** this study,25 patients with type 2 diabetes and 50 healthy subjects were selected based on their clinical ***,height,weight,blood pressure,and pulse pressure were collected as the subjects’basic *** brachial-ankle pulse wave velocity(baPWV)was collected as an index of arterial *** of time[the pulse wave period(T),the relative positions of peak point(T1)and notch point(T2),and pulse wave time difference between upper and lower limbs(T3)]and area[the total waveform area(A),and the areas of the waveform before(A1)and after(A2)the notch point]were extracted from the pulse wave signals as pulse waveform *** independent sample t-test was performed to determine whether there were significant differences between ***’s correlation analysis was performed to determine the correlations between pulse waveform parameters and *** were significant differences in T3,A,A1,and A2 between the groups(p<0.05).For patients with type 2 diabetes,there were statistically significant correlations between baPWV and T3,A,A1,and A2(p<0.05).This study quantitatively assessed changes in arterial pulse waveform parameters in patients with type 2 *** was demonstrated that pulse waveform characteristics(T3,A,A1,and A2)could be used as indices of arterial stiffness in patients with type 2 diabetes.

关键词： Type 2 diabetes pulse waveform arterial stiffness.

Project Scheduling Using Hybrid Genetic Algorithm with Fuzzy Logic Controller in SCM Environment

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Tsinghua Science and Technology 2003年第1期8卷 19-29页

作者： mitsuo Gen KwanWoo Kim Genji Yamazaki Graduate School of Information Production & Systems Waseda UniversityDepartment of Intelligent Systems Tokyo Metropolitan Institute of TechnologyDepartment of Intelligent Systems Tokyo Metropolitan Institute of Technology Kitakyushu 808-0135 Japan Hino-city Tokyo 190-0065 Japan Hino-city Tokyo 190-0065 Japan

In supply chain management (SCM) environment, we consider a resource-constrained project scheduling problem (rcPSP) model as one of advanced scheduling problems considered by a constraint programming technique. We develop a hybrid genetic algorithm (hGA) with a fuzzy logic controller (FLC) to solve the rcPSP which is the well known NP-hard problem. This new approach is based on the design of genetic operators with FLC through initializing the serial method which is superior for a large rcPSP scale. For solving these rcPSP problems, we first demonstrate that our hGA with FLC (flc-hGA) yields better results than several heuristic procedures presented in the literature. We have revealed a fact that flc-hGA has the evolutionary behaviors of average fitness better than hGA without FLC.

关键词： resource-constrained project scheduling problem (rcPSP) priority rule method (PRM) hybrid genetic algorithm (hGA) fuzzy logic controller (FLC)

The Effect of Spherical Surface on Noise Suppression of a Supersonic Jet

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Journal of Thermal Science 2003年第2期12卷 144-150,113页

作者： Md.TawhidulIslamKhan KunisatoSeto ZhixiangXu H.ohta Graduate School Saga UniversitySaga 840-8502JapanDepartment of Mechanical EngineeringSaga UniversitySaga 840-8502JapanDepartment of Mechanical EngineeringSaga UniversitySaga 840-8502JapanDepartment of Mechanical EngineeringNational Fishery UniversityShimonosekiJapan

Experiments were carried out to eliminate the screech tone generated from a supersonic jet. Compressed air was passed through a circular convergent nozzle preceded by a straight tube of same diameter. In order to reduce the jet screech a spherical reflector was used and placed at the nozzle exit. The placement of the spherical reflector at the nozzle exit controlled the location of the image source as well as minimized the sound pressure at the nozzle exit. The weak sound pressure did not excite the unstable disturbance at the exit. Thus the loop of the feedback mechanism could not be accomplished and the jet screech was eliminated. The technique of screech reduction with a flat plate was also examined and compared with the present method. A good and effective performance in canceling the screech component by the new method was found by the investigation. Experimental results indicate that the new system suppresses not only the screech tones but also the broadband noise components and reduces the overall noise of the jet flow. The spherical reflector was found very effective in reducing overall sound pressure level in the upstream region of the nozzle compared to a flat plate. The proposed spherical reflector can, accordingly, protect the upstream noise propagation.

关键词： under-expanded supersonic jet jet screech spherical reflector noise reduction.

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

Endoplasmic reticulum stress transducer old astrocyte specifically induced substance contributes to astrogliosis after spinal cord injury

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Neural Regeneration Research 2018年第3期13卷 536-540页

作者： Atsushi Takazawa Naosuke Kamei Nobuo Adachi mitsuo Ochi Department of Orthopaedic Surgery Graduate School of Biomedical & Health Sciences Hiroshima University Medical Center for Translational & Clinical Research Hiroshima University Hospital

Old astrocyte specifically induced substance （OASIS） is an endoplasmic reticulum （ER） stress transducer specifically expressed in astrocytes and osteoblasts. OASIS regulates the differentiation of neural precursor cells into astrocytes in the central nervous system. This study aimed to elucidate the involvement of ER stress responses stimulated via OASIS in astrogliosis following spinal cord injury. In a mouse model of spinal cord contusion injury, OASIS mRNA and protein expression were evaluated at days 7 and 14. A significant increase in OASIS mRNA on day 7 and an increase in protein on days 7 and 14 was observed in injured spinal cords. Immunostaining on day 7 revealed co-localization of OASIS and astrocytes in the periphery of the injury site. Furthermore, anti-OASIS small interfering RNA （siRNA） was injected at the injury sites on day 5 to elucidate the function of OASIS. Treatment with anti-OASIS siRNA caused a significant decrease in OASIS mRNA on day 7 and protein on days 7 and 14, and was associated with the inhibition of astrogliosis and hindlimb motor function recovery. Results of our study show that OASIS expression synchronizes with astrogliosis and is functionally associated with astrogliosis after spinal cord injury.

关键词： unfolded protein response cAMP-response element binding protein/activating transcription factor protein family C57BL/6 contusion injury reactive astrocyte functional recovery real-time polymerase chain reaction western blot immunohistochemistry glial fibrillary acidic protein

Smudge on tinplate steel sheets and the effects of cathodic dichromate treatment

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Journal of Harbin Institute of Technology(New Series) 2001年第4期8卷 363-366页

作者：李宁李平黎德育 mitsuo Kurachi Dept. of Applied Chemistry Harbin Institute of Technology Kyoto University

Smudge is black granules that scatter on tinplate sheet; it was formed during the process of plating and storing, and seriously affected the function and appearance of tinplate sheet. Reflowing and cathodic dichromate treatment (CDC) are two major phases in which smudge is produced. In this paper, the appearance and component of smudge was analyzed by means of whiteness meter, SEM and EDS quantitatively. Factors of CDC conditions was studied. Results of tests showed that whiteness measurement is convenient to evaluation of the degree of smudge and the effects of CDC on it , quantitatively.

关键词： tinplate smudge CDC whiteness meter

Dry Machining Tool Design via Chlorine Ion Implantation

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材料热处理学报 2004年第5B期25卷 879-882页

作者： Tatsuhiko Aizawa Atsushi mitsuo Shigeo Yamamoto Shinji Muraishi Taro Sumitomo Center for Collaborate Research University of Tokyo Tokyo JapanTokyo Metropolitan Industrial Research Institute Tokyo JapanTokyo Metropolitan Industrial Research Institute Tokyo JapanDepartment of Materials Science Technology Tokyo Institute of Technology Tokyo JapanCenter for Collaborate Research University of Tokyo Tokyo Japan

Dry machining has become a key issue to significantly reduce the wastes of used lubricants and cleaning agents and to improve the environmental consciousness for medical and food applications of special tooling. Since the tools and metallic works are in direct contact in dry, severe adhesive wear and oxidation are thought to occur even at the presence of hard protective coatings. Self-lubrication mechanism with use of lubricous oxide films is found to be effective for dry machining. Through the chlorine ion implantation to tools, titanium base oxides are in-situ formed on the tool surface. This oxide deforms elasto-plastically so that both friction coefficient and wear volume are reduced even in the high-speed cutting.

关键词：氯离子注入自动润滑 TiN涂层 TiCN涂层干机械加工

Low-cost surface modification of a biomedical Zr-2.5Nb alloy fabricated by electron beam melting

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Journal of Materials Science & Technology 2023年第12期143卷 178-188页

作者： Caixu Wang Xiaoli Zhao Shujun Li Lu Liu Deliang Zhang mitsuo Niinomi School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Key Laboratory of Data Analytics and Optimization for Smart Industry(Ministry of Education) Northeastern UniversityShenyang 110819China Tianjin Key Laboratory of Bone Implants Interface Functionalization and Personalization Tianjin 300190China Institute for Materials Research Tohoku UniversitySendaiMiyagi 9808577Japan Division of Materials and Manufacturing Science Graduate School of EngineeringOsaka UniversityOsaka 565-0871Japan Department of Materials Science and Engineering Graduate School of Science and TechnologyMeijo UniversityNagoya 468-8502Japan Faculty of Chemistry Materials and BioengineeringKansai UniversityOsaka 564-860Japan

The Zr-2.5Nb alloy with a fine microstructure consisting ofαlaths was successfully prepared by electron beam melting(EBM).The thermal oxidation behaviors and kinetics of the as-built,and the EBM-built and hot isostatically pressed(HIPed)Zr-2.5Nb materials in a temperature range of 450-600°C were in-vestigated and compared with those of the alloy prepared by conventional casting and *** was found that the oxidation kinetics of the as-built and the forged materials followed the parabolic rate law during isothermal oxidation at 550°C,but the HIPed materials exhibited a parabolic-to-linear kinetic transition,suggesting that the larger grain sizes enhanced the *** oxide layers of all materials were composed of a large fraction of monoclinic zirconia phase(m-ZrO_(2))and a small fraction of tetrago-nal zirconia phase(t-ZrO_(2)),and transformed from t-ZrO_(2)to m-ZrO_(2)with increasing oxidation *** surface hardness of the as-built,the forged and the HIPed materials increased from 215,204,and 188 HV before oxidation to 902,1070,and 1137 HV after oxidation,*** cross-sections of the materi-als showed the presence of micropores and microcracks inside the oxide layers with thicknesses ranging from 4 to 8μ*** the oxidation temperature of 600°C and oxidation time duration of 3 h,a dense black m-ZrO_(2)oxide layer with smooth surface and 902 HV hardness was obtained on the EBM as-built Zr-2.5Nb materials.

关键词： Zr-2.5Nb alloy Electron beam melting Thermal oxidation Oxidation behaviors and kinetics Grain size