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International Journal of minerals,metallurgy and materials 1998年第3期12卷 134-139页

作者： K Ogura W Lou m nakayama T Fukume(Department of Applied Chemistry, Yamaguchi University, Ube 755, Japan Department of Applied Chemistry Yamaguchi University Ube 755 Japan

Potential oscillations of a stainless steel electrode galvanostatically anodized have been observed in amixture of chromic and sulfuric acids. The potential regularly oscillated between 1.6 V vs. SCE (lower) and 2.1V(upper) with a certain frequency. The potential values are affected neither by the composition of chromic and sulfu-ric acids nor by the magnitude of applied current density although the potential frequency is very sensitive to theseparameters. This phenomenon is interpreted in terms of the repeated formation and disappearance of the saturatedlayer of dichromate ions on the electrode surface. Such scheme is consistent with the in situ FTIR spectroscopicresult that the concentration of Cr2O ions on the electrode surface increased with time during the polarization atthe lower potential but the change in concenetion of Cr2O ions was negligible at the higher potential.

关键词： stainless steel electrode potential galvanostatic polarization

molecular Characterization and mRNA Expression of Cytochrome P450 1A1 and Cytochrome P450 3A in Liver of Kafue Lechwe (<i>Kobus leche kafuensis</i>) as Potential Biomarkers of Pollution of the Kafue River Basin, Zambia

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Engineering（科研） 2014年第2期6卷 51-58页

作者： Ethel m’kandawire michelo Syakalima Kaampwe muzandu Girja Pandey martin Simuunza Shouta m. m. nakayama Yusuke K. Kawai Yoshinori Ikenaka mayumi Ishizuka Animal Health Department Northwest University Mafikeng Campus Mmabatho South Africa Department of Biomedical Sciences School of Veterinary Medicine University of Zambia Lusaka Zambia Department of Disease Control School of Veterinary Medicine University of Zambia Lusaka Zambia Laboratory of Toxicology Department of Environmental Veterinary Sciences Graduate School of Veterinary Medicine Hokkaido University Sapporo Japan

The aim of this study was to characterize CYP1A1 and CYP3A in liver of the Kafue lechwe from Lochnivar and Blue Lagoon GmAs and to determine their mRNA expression levels as potential biomarkers of pollution. Increasing attention is paid to the problem of pesticide pollution by people. Risk assessment of pesticide should not be only based on the chemical analysis of environmental samples, since this method could not truly distinguish whether the pesticide was harmful to environment. Thus, biological assessment should be established.

关键词： Lochnivar Game management Area Blue Lagoon Game management Area Pestcides/Herbicides Biomonitoring Phylogenetic Relationships Real-Time RT-PCR

High-temperature corrosion of sintered RE_(2)Si_(2)O_(7)(RE=Yb and Ho)environmental barrier coating materials by volcanic ash

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International Journal of minerals,metallurgy and materials 2024年第7期31卷 1628-1638页

作者： Ayahisa Okawa Son Thanh Nguyen Tadachika nakayama Thi-mai-Dung Do Hisayuki Suematsu Shu Yin Takuya Hasegawa Tsuneo Suzuki Takashi Goto Koichi Niihara Institute of multidisciplinary Research for Advanced materials Tohoku UniversitySendai 980-8577Japan Department of Creative Engineering National Institute of TechnologyKushiro 084-0916Japan Extreme Energy-Density Research Institute Nagaoka University of TechnologyNagaoka 940-2188Japan Advanced Institute for materials Research(WPI-AImR) Tohoku UniversitySendai 980-8577Japan

Rare-earth silicates are promising environmental barrier coatings(EBCs)that can protect SiC_(f)/Si C_(m)substrates in next-genera tion gas turbine ***,RE_(2)Si_(2)O_(7)(RE=Yb and Ho)shows potential as an EBC due to its coefficient of thermal expansion(CTE)compatible with substrates and high resistance to water vapor *** target operating temperature for next-generation tur bine blades is 1400°*** is inevitable during adhesion to molten volcanic ash,and thus,understanding the corrosion behavior o the material is crucial to its *** study investigates the high-temperature corrosion behavior of sintered RE_(2)Si_(2)O_(7)(RE=Yb and Ho).Samples were prepared using a solid-state reaction and hot-press *** were then exposed to volcanic ash at 1400°C for 224,and 48 *** 48 h of exposure,volcanic ash did not react with Yb_(2)Si_(2)O_(7)but penetrated its interior,causing *** Ho_(2)Si_(2)O_(7)was partially dissolved in the molten volcanic ash,forming a reaction zone that prevented volcanic ash melts from penetrating the *** increasing heat treatment time,the reaction zone expanded,and the thickness of the acicular apatite grains increased The Ca:Si ratios in the residual volcanic ash were mostly unchanged for Yb_(2)Si_(2)O_(7)but decreased considerably over time for Ho_(2)Si_(2)O_(7).Th Ca in volcanic ash was consumed and formed apatite,indicating that RE^(3+)ions with large ionic radii(Ho>Yb)easily precipitated apatit from the volcanic ash.

关键词： environmental barrier coating volcanic ash rare-earth disilicate corrosion

单次肺活量吸入稳定氙气之后进行的屏气双能量CT通气成像

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国际医学放射学杂志 2012年第2期 172-173页

作者： N.Honda H.Osada W.Watanabe m.nakayama K.ishimura B.Krauss 肖立志 Department of Radiology Saitama Medical CenterSaitama Medical University1981 KamodaKawagoeSaitama 350-8850Japan

目的在模型和志愿者中评估双能量CT单次屏气技术通气图。材料与方法本研究得到机构审查委员会批准,所有志愿者均签署知情同意书。双源双能量CT对充满氙气(0～35.4%)和氧气混合气体的橡胶袋进行扫描[分别为80kV

关键词：双能量单次氙气 CT

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从沃洲小鹦鹉分离的新禽付粘液病毒

河南预防医学杂志 1978年第3期 62-62页

作者： K.Nezome m.nakayama 陈美光

一九七四年在日本东京、Kunitachi 调查流感流行中,发现沃洲小鹦鹉中的流行病,其病原因子具有红血球凝集、神经氨酸酶活性以及溶血作用等特点,该病原因子是从死亡的沃洲小鹦鹉的肺组织中分离到的。经形态学研究,发现该因子具有多形态,直... 详细信息

一九七四年在日本东京、Kunitachi 调查流感流行中,发现沃洲小鹦鹉中的流行病,其病原因子具有红血球凝集、神经氨酸酶活性以及溶血作用等特点,该病原因子是从死亡的沃洲小鹦鹉的肺组织中分离到的。经形态学研究,发现该因子具有多形态,直径100～300毫微米,所含核糖核蛋白呈螺旋状卷曲,螺旋结构的直径大约20毫微米,其结构的中心孔隙宽约5毫微米。暂时将这种病原因子称为 Kunitachi 病毒。

关键词：鹦鹉沃洲粘液

Conduction-radiation effect on natural convection flow in fluid-saturated non-Darcy porous medium enclosed by non-isothermal walls

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Applied mathematics and mechanics(English Edition) 2013年第6期34卷 687-702页

作者： m. A. HOSSAIN m. SALEEm S. C. SAHA A. nakayama Department of mathematics COMSATS Institute of Information Technology School of Chemistry Physics & Mechanical Engineering Queensland University of Technology Department of mechanical Engineering Shizuoka University

The combined effect of conduction-convection-radiation on natural convec- tion flow of an optically thick Newtonian fluid with gray radiant properties, confined in a porous media square cavity with Darcy-Brinkman-Forchheimer drag is studied numeri- cally. For a gray fluid, Rosseland diffusion approximation is considered. It is assumed that （i） the temperature of the left vertical wall varies linearly with height, （ii） the right vertical and top walls are at a lower temperature, and （iii） the bottom wall is uniformly-heated. The governing equations are solved using the alternate direct implicit method together with the successive over relaxation technique. The investigation of the effect of governing parameters, namely, the Forschheimer resistance （F）, the temperature difference （A）, and the Plank number （Rd）, on the flow pattern and heat transfer characteristics is carried out. It can be seen that the reduction of flow and heat transfer occur as the Forschheimer resistance is increased. On the other hand, both the flow strength and heat transfer in- crease as the temperature ratio A is increased.

关键词： conduction-convection-radiation,Darcy-Brinkman-Forchheimer drag porousmedium enclosure

Effect of dissolved oxygen on methane production from bottom sediment in a eutrophic stratified lake

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Journal of Environmental Sciences 2023年第3期125卷 61-72页

作者： Yasuyuki maruya Keisuke nakayama masafumi Sasaki Katsuaki Komai Graduate School of Engineering Kyushu University744 MotookaNishi-KuFukuoka 819-0395Japan Graduate School of Engineering Kobe UniversityRokkodai-Cho 1-1Nada-KuKobe 657-8501Japan Department of Engineering Kitami Institute of TechnologyKohen-Cho 165Kitami 090-8507Japan

Clarifying the role of sulfate and dissolved oxygen (DO) in methane production may allow for precise and accurate modeling of methane emissions in eutrophic *** conducted field observations of sulfate,methane,and DO concentrations in Lake Abashiri,a typical brackish and eutrophic lake in a cold region,to develop a DO-based method for quantitively estimating methane production in a eutrophic lake and analyzed the *** found that sulfate concentrations decreased rapidly from 900.0 mg/L in water overlying the sediments to nearly 0.0 mg/L in the bottom *** production was almost uniform across sediment depths of 0.05 to 0.25 m,ranging from 1400 to 1800μmol/m^(2)/***,methane production was found to be a function of DO concentrations in water overlying the bottom and could be modeled by a logistic function:constant production at 1,400μmol/m^(2)/day for DO concentrations of 0.0 to 3.0 mg/L,rapidly decreasing to 0μmol/m^(2)/day for DO concentrations of 3.0 to 6.0 mg/*** methane model was verified using a simple one-dimensional numerical model that showed good agreement with field *** results thus suggest that the proposed methane model reduces uncertainty in estimating methane production in a eutrophic lake.

关键词： Dissolved oxygen(DO) Stratification methane Anoxia Numerical simulation

Electrochemical Characterization of a Porous Pt Nanoparticle ＂Nanocube-mosaic＂ Prepared by a modified Polyol method with HCI Addition

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Nano Research 2011年第8期4卷 746-758页

作者： Randy Jalem Ryosuke Koike Yong Yang masanobu nakayama masayuki Nogami Department of materials Science and Engineering Nagoya Institute of Technology Showa Nagoya 466-8555 Japan

Porous and single crystalline platinum （Pt） nanoparticles （NPs） have been successfully synthesized by reduction of H2PtC16.6H20 and then investigated by optical spectroscopy and transmission electron microscopy. H2PtCI6-6H20 was reduced using ethylene glycol in the presence of polyvinylpyrrolidone under highly acidic conditions （pH 〈 1） to form single crystalline Pt particles about 5 nm in size. These particles were then stacked via {100} facets, forming 50-nm length porous nanocubes with a mosaic structure. The porous Pt NPs exhibited excellent catalytic properties for methanol oxidation. In particular, the electrochemical surface area was -63 m2/g, five times higher than that for non-porous Pt NPs prepared using a conventional method. We suggest that the high catalytic activity of porous Pt NPs is due to a combination of the crystalline structure having exposed {100} facets and a porous morphology.

关键词： Platinum porous nanoparticles catalyst methanol oxidation cyclic voltammetry

Lessons learned from the Ezgeleh-Sarpol Zahab earthquake of November 2017:status of damage and disposal of disaster waste

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Waste Disposal and Sustainable Energy 2019年第4期1卷 301-317页

作者： Amirhomayoun Saffarzadeh Takayuki Shimaoka Hirofumi nakayama Saeed Afsari Fard Faculty of Engineering Department of Urban and Environmental EngineeringKyushu University744 Motooka Nishi-kuFukuoka 819-0395Japan mahab Ghodss Consulting Engineering Co. No.16TakharestanDastgerdy Av.Tehran 19187-83414Iran

A massive earthquake of magnitude mw 7.3 shook Kermanshah Province in Western Iran along the Iraqi border on November 12,*** epicenter of the earthquake was approximately 10 km southwest of Ezgeleh Town in Kermanshah *** observations almost 4 months after the disaster indicated that the earthquake had caused tremendous damage to most structures in both urban and rural areas,and left an enormous amount of disaster *** investigate the status of the dam-age and disposal of the disaster waste,remote sensing was conducted using an unmanned aerial vehicle(drone).Through the capture of low-altitude images by drone and the generation of 3D models,the quantity of debris accumulated in a waste disposal facility near Sarpol Zahab was estimated at approximately 480,000 m3.A compositional analysis of the disaster waste was performed using an imaging *** revealed that the disaster waste was largely composed of concrete(39.6%),hollow brick(35.4%),and gypsum(21.2%)in the urban area,whereas soil was the dominant component(77.4%)in the rural *** damage caused to most buildings was essentially due to their non-standard *** manage-ment of debris from the damaged buildings was a critical issue for the authorities,and the lack of preparedness was a serious drawback that consumed an enormous amount of time,budget,and workforce.A practical post-disaster preparedness plan would help the decision-makers and the public to manage the otherwise overwhelming nature of the post-disaster conditions in a more reasonable manner.

关键词： 2017 Iran Earthquake Ezgeleh-Sarpol Zahab Disaster waste disposal Waste compositional analysis Remote sensing

A new scorpion polypeptide enhances the binding of radiolabeled-ryanodine on ryanodine receptor in sarcoplasmic reticulum of rabbit skeletal muscle

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Chinese Science Bulletin 1997年第2期42卷 147-151页

作者： Seiko Kawano Yoshiyuki Hirayama masayasu Hiraoka Akihiko Kuniyasu Hitoshi nakayama Department of Cardiovascular Diseases M R 1 Tokyo Medical and Dental University JapanDepartment of Cardiovascular Diseases M R 1 Tokyo Medical and Dental University JapanDepartment of Cardiovascular Diseases M R 1 Tokyo Medical and Dental University JapanFaculty of Pharmaceutical Science Hokkaido University Japan Faculty of Pharmaceutical Science Kumamoto University Japan

RYANODINE is a toxic alkaloid from the plant Ryania speciosa Vahl. It selectively binds to the Ca2+ release channel on skeletal and cardiac heavy sarcoplasmic reticulum （HSR） and has

关键词： scorpion Buthus martensi Karsch ryanodine receptor toxic polypeptide.