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Biomimetic artificial cartilage:fibre-reinforcement of PVA hydrogel to promote biphasic lubrication mechanism

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Biosurface and Biotribology 2019年第1期5卷 13-19页

作者： Nobuo Sakai Seido Yarimitsu Yoshinori Sawae Mochimitsu Komori teruo murakami Integrated Systems Engineering Kyushu Institute of TechnologyKitakyushuJapan Intelligent Mechanical Systems System DesignTokyo Metropolitan UniversityTokyoJapan Mechanical Engineering Kyushu UniversityFukuokaJapan Research Center for Advanced Biomechanics Kyushu UniversityFukuokaJapan Medical Technology Teikyo UniversityOmutaJapan

The fibre-reinforced structure in synovial articular cartilage plays an important role in enhancing the fluid load support in the biphasic lubrication ***(vinyl alcohol)(PVA)hydrogel is a potential biomimetic articular cartilage *** this study,PVA hydrogel was reinforced with PVA fibres to improve its frictional *** computational analysis,the position of the PVA fibre layer was examined with a migrating contact condition to reduce the friction *** improve the fibre reinforcement,a method for fibre placement was developed to retain the initial strain of the fibre in the hydrogel *** experimental results showed that the fibre-reinforced PVA hydrogel with a surface fibre layer had a low friction coefficient of 0.031 in pure *** fibre-reinforced PVA hydrogel successfully reduced friction coefficient.

关键词： mechanism. material. fibre

My personal stories and anecdotes with the late Professor Duncan Dowson

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Biosurface and Biotribology 2021年第2期7卷 43-52页

作者： John B.Medley teruo murakami Zhongmin Jin Department of Mechanical and Mechatronics Engineering University of WaterlooWaterlooOntarioCanada Kyushu University FukuokaJapan The Leeds Joint School and School of Mechanical Engineering Southwest Jiaotong UniversityChengduChina

1JOHN *** Professor Duncan Dowson had a major influence on my life,both personal and *** supervised my PhD,collaborated with me on setting up the Leeds-Waterloo Stu-dent Exchange Program and co-authored academic papers with *** my PhD studies,he even,indirectly,found me a wife(Judith Dowling)who came from his research *** always took an interest in my career,my ideas and my *** was my friend.I have tried,in this short rendition of stories and anecdotes,to convey the essence of my personal interactions with Duncan.

关键词： son tried tori

Transitional behaviour between biphasic lubrication and soft elastohydrodynamic lubrication of poly(vinyl alcohol)hydrogel using microelectromechanical system pressure sensor

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Biosurface and Biotribology 2018年第1期4卷 24-33页

作者： Nobuo Sakai Seido Yarimitsu Yoshinori Sawae Mochimitsu Komori teruo murakami Integrated System Engineering Kyushu Institute of TechnologyKitakyushuJapan Intelligent Mechanical Systems System DesignTokyo Metropolitan UniversityTokyoJapan Mechanical Engineering Kyushu UniversityFukuokaJapan Research Center for Advanced Biomechanics Kyushu UniversityFukuokaJapan Medical Technology Teikyo UniversityOmutaJapan

The soft hydrogel material is expected for a candidate material as biomimetic artificial cartilage with synergisticfunctionalities of adaptive multimode *** boundary lubrication mode of hydrogel material,the biphasiclubrication mechanism cooperatively exerts its *** hydrodynamic lubrication mode,it is preferable that thelubricating surfaces be impermeable to trap the fluid pressure in contact surfaces,whereas the actual biphasic materiallike a hydrogel is a permeable material with surface *** is indicated that the interstitial fluid pressurisation inthe permeable biphasic material can contribute to significant fluid load support under lower sliding speed ***,the authors examined how the contrary fluid pressure effect appears in the transition from the boundarylubrication mode to soft elastohydrodynamic lubrication *** the experiment,a small pressure sensor was utilisedto measure the in-situ fluid pressure in sliding *** the experimental condition of this study wasselective,the result showed a possibility of the negative effect of the biphasic surface,in which the permeable surfacediminished the hydrodynamic fluid *** means that one should manage and enhance the biphasic lubricationabilities in wide operation range when the hydrogel material was used as a load bearing material.

关键词： hydrogel behaviour synergistic

Neutral Pion Electromagnetic Form Factor as a Bound System of 3 + 1 Dimensional QCD

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Journal of Modern Physics 2024年第7期15卷 1036-1044页

作者： teruo Kurai 1-19-18-503 Unoki Ohta-ku Tokyo Japan

We investigate a neutral pion electromagnetic form factor in momentum space and obtain Gaussian-like function for it. The characteristic form of our neutral pion electromagnetic form factor is consistent with the resu... 详细信息

关键词： Neutral Pion Electromagnetic Form Factor Gaussian-Like Function

Erratum to: Influence of synovia constituents on tribological behaviors of articular cartilage

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Friction 2014年第4期2卷 391-391页

Erratum to Friction 1(2):150-162(2013)DOI 10.1007/s40544‐013‐0010‐6 The original version of this article unfortunately contained the incorrect lengend“HA 0.5 wt%+DPPC 0.01 wt%+albumin 1.4 wt%”in Fig.7 on page 155... 详细信息

关键词： Friction tribological behaviors

PEO coating on Mg-Ag alloy:The incorporation and release of Ag species

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镁合金学报(英文) 2023年第6期11卷 2182-2195页

作者： Xinxin Zhang Yupeng Zhang You Lv Zehua Dong Lei Yang Erlin Zhang teruo Hashimoto Xiaorong Zhou Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China Hubei Engineering Research Centre for Biomaterials and Medical Protective Materials Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory for Anisotropy and Texture of Materials Education Ministry of ChinaSchool of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Corrosion and Protection Centre Department of MaterialsThe University of ManchesterManchester M139PLUnited Kingdom

In the present study,the distribution of Ag in the coating formed on Mg-Ag alloy by plasma electrolytic oxidation(PEO)and its ionic release kinetics when exposed to a 0.9 wt.%Na Cl solution at 37℃have been *** metallic Ag and Ag oxide particles with~5 to~40 nm in diameters were observed in the PEO ***,an Ag-enriched layer of~20 nm in thickness at the substrate/coating interface was also *** PEO coating on the Mg-Ag alloy not only increases its corrosion resistance with the corrosion current density decreasing by up to 3 orders of magnitude from 8.04×10^(-3)to 4.03×10^(-6)A/cm^(2),but also controls the release of Ag+to the level that is sufficient for anti-infective efficacy without causing cytotoxicity to mammal cells.

关键词： Mg-Ag alloy Plasma electrolytic oxidation Ag distribution Ag release Corrosion resistance

A New Electron Charge Distribution Function of Electron

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Journal of Modern Physics 2023年第2期14卷 111-126页

作者： teruo Kurai Unoki Ota-ku Tokyo Japan

Here we derive a new charge distribution function for an electron by using as an equation of motion a segment of charge whose self energy interaction is due to electric field potential. Our method is based on the consideration that a charged distribution function should be represented as an eigenfunction of electron mass energy. We compare our electron charge distribution function to that of Weinberg’s η(r) and our charged electron radius to that obtained by Kim.

关键词： Charge Distribution Function Electron

Effects of dissolved organic matter on the growth and pigments synthesis of Spirulina platensis (Arthrospira)

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Progress in Natural Science:Materials International 2006年第1期16卷 50-54页

作者： WATANABE teruo China Hainan DIC Microalgae Co. Ltd. Haikou International Commercial Centre 38 Haikou 570102

Excessive accumulation of dissolved organic matter (DOM) in the culture ponds of Spirulina platensis is usually considered to be one of the potential factors affecting the production of S. platensis, however, we are not quite aware of effects of DOM on the growth and pigments synthesis of S. platensis. In the present study, S. platensis was grown in batch or semi-continuous cultures using the filtrate in the culture ponds that had not been renewed for years. It was found that disssolved organic carbon up to 60 mg/L did not bring about an inhibitory effect on the growth of S. platensis, but increased the contents of chlorophyll a and phycocyanin instead. However, further accumulation of dissolved organic matter could decrease the content of chlorophyll a .

关键词： Chl a dissolved organic matter PC specific growth rate Spirulina platensis (Arthrospira).

Effects of solar ultraviolet radiation on the photochemical efficiency, photosynthetic pigments and biomass production of Spirulina platensis

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Progress in Natural Science:Materials International 2005年第5期15卷 477-480页

作者： teruo WATANABE China Haikou 570102 Haikou International Commercial Centre 38 Hainan DIC Microalgae Co. Ltd.

Effects of solar ultraviolet radiation (UVR) on Spirulina platensis were studied by investigating its photochemical efficiency, photosynthetic pigments and biomass production while exposed to full spectrum solar radiation or depleted of UVR for understanding how and to what extent UVR influences its photosynthetic physiology and production. It was found that UVR brought about an extra inhibition of photochemical efficiency by 26%—30%. The greatest inhibition of photochemical efficiency in S. platensis was observed at noontime, and then recovered to some extent in late afternoon no matter which treatment they were exposed to. The contents of chlorophyll a, phycocyanin and carotenoids increased during initial stage of the exposure, but decreased with elongated exposure. UVR decreased the biomass yield by about 6%. It indicated that filtering out UVR of solar radiation would raise the productivity of S. platensis, which is an important factor that should be considered in the production.

关键词： ultraviolet radiation Spirulina platensis photochemical efficiency biomass production pigments.