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Flow and geochemical modeling of drainage from Tomitaka mine,Miyazaki,Japan

Journal of Environmental Sciences 2015年第10期27卷 130-143页

作者： Kohei Yamaguchi Shingo tomiyama Hideya Metugi Hiroyuki Ii Akira Ueda Mitsubishi Materials Corporation 1-297 KitabukuroOmiyaSaitama 330-0835Japan Mitsubishi Materials Techno Corporation 1-14-16 KudankitaChiyoda-kuTokyo 102-8205Japan Faculty of Systems Engineering Wakayama University Japan Oil Gas and Metals National Corporation Graduate School Division of Science and Engineering University of Toyama

The chemistry and flow of water in the abandoned Tomitaka mine of Miyazaki, western Japan were investigated. This mine is located in a non-ferrous metal deposit and acid mine drainage issues from it. The study was undertaken to estimate the quantities of mine drainage that needs to be treated in order to avoid acidification of local rivers, taking into account seasonal variations in rainfall. Numerical models aimed to reproduce observed water levels and fluxes and chemical variations of groundwater and mine drainage. Rock–water interactions that may explain the observed variations in water chemistry are proposed. The results show that：（1） rain water infiltrates into the deeper bedrock through a highly permeable zone formed largely by stopes that are partially filled with spoil from excavations（ore minerals and host rocks）;（2） the water becomes acidic（p H from 3 to 4） as dissolved oxygen oxidizes pyrite;（3） along the flow path through the rocks, the redox potential of the water becomes reducing, such that pyrite becomes stable and p H of the mine drainage becomes neutral; and（4） upon leaving the mine, the drainage becomes acidic again due to oxidation of pyrite in the rocks. The present numerical model with considering of the geochemical characteristics can simulate the main variations in groundwater flow and water levels in and around the Tomitaka mine, and apply to the future treatment of the mine drainage.

关键词： Mine drainage Hydrogen isotope Oxygen isotope Rock–water interaction Water movement

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Electropolymerized poly(Toluidine Blue)-modified carbon felt for highly sensitive amperometric determination of NADH in flow injection analysis

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Journal of Environmental Sciences 2011年第6期23卷 1050-1056页

作者： Yasushi Hasebe Yue Wang kazuya Fukuoka Department of Life Science and Green Chemistry Saitama Institute of Technology 1690 Fusaiji Fukaya Saitama 369-0293 Japan Department of Materials Science and Engineering Graduate School of Engineering Saitama Institute of Technlogy 1690 Fusaiji Fukaya Saitama 369-0293 Japan School of Chemical Engineering University of Sciences and Technology Anshan 114044 China

Poly（pheniothiazine） films were prepared on a porous carbon felt（CF） electrode surface by an electrooxidative polymerization of three phenothiazine derivatives（i.e.,Tthionine（TN）,Toluidine Blue（TB） and Methylene Blue（MB）） from 0.1 mol/L phosphate buffer solution（pH 7.0）.Among the three phenothiazies,the poly（TB） film-modified CF exhibited an excellent electrocatalytic activity for the oxidation of nicotinamide adenine dinucleotide reduced form（NADH） at ＋0.2 V ***/*** poly（TB） film-modified CF was successfully used as working electrode unit of highly sensitive amperometric flow-through detector for *** peak currents（peak heights） were almost unchanged,irrespective of a carrier flow rate ranging from 2.0 to 4.1 mL/min,resulting in the measurement of NADH（ca.30 samples/hr） at 4.1 mL/*** peak current responses of NADH showed linear relationship over the concentration range from 1 to 30 μmol/L（sensitivity：0.318 μA/（μmol/L）;correlation coefficient：0.997）.The lower detection limit was found to be 0.3 μmol/L（S/N = 3）.

关键词： poly(phenothiazine) Toluidine Blue electropolymerization carbon felt NADH flow injection analysis

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The New Plating Process on Plastics

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材料热处理学报 2004年第5B期25卷 1119-1121页

作者： Makoto Imamura Jun Okada kazuya Satoh Okuno Chemical Industries Co. Ltd JapanOkuno Chemical Industries Co. Ltd JapanOkuno Chemical Industries Co. Ltd Japan

This process does not use general electroless plating solution containing formaldehyde(carcinogen) and phosphate(the object of waste water regulation). Furthermore, we succeeded in developing a new electroless copper plating solution which is usable semi-permanently by using the special reducing agent. The electroless deposition forms a very thin conductive film on substrate. Therefore, it can prevent some appearance defects (e.g. pits, pin-holes, laminations and inclusions) that occur in the conventional ones. In addition, it is possible to eliminate electroplating of copper from the process by applying the exclusive nickel solution in electroplating. Therefore, the obtained metal parts can be recycled as high quality stainless steel. Given this copper electroplating-free process, 25 u m-thick nickel deposition at the stage of electroplating, at least, enables the metal layers to show properties as versatile as those of the conventional(its total thickness is 25 n m in the comparative conventional process).

关键词：电镀再循环调磷调氮合成树脂

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Wave Propagation Simulation Using the CIP Method of Characteristic Equations

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Communications in Computational Physics 2008年第1期3卷 121-135页

作者： kazuya Shiraishi Toshifumi Matsuoka Department of Civil&Earth Resources Engineering Kyoto University Kyotodaigaku-Katsura Nishikyo-kuKyoto 615-8540Japan

We apply the CIP(Cubic Interpolated Profile)scheme to the numerical sim-ulation of the acoustic wave propagation based on characteristic *** CIP scheme is based on a concept that both the wavefield and its spatial deriv ative propa-gate along the same characteristic curves derived from a hyperbolic differential *** describe the derivation of the characteristic equations for the acoustic waves from the basic equations by means of the directional splitting and the diagonaliza-tion of the coffcient matrix,and establish geophysical boundary *** the CIP scheme calculates both the wavefield and its spatial derivatives,it is easy to realize the boundary conditions *** also show some numerical simula-tion examples and the CIP can simulate acoustic w ave propagation with high stability and less numerical *** method of characteristics with the CIP scheme is a very powerful technique to deal w ith the wave propagation in complex geophysical problems.

关键词： Acoustic wave characteristi cequa tion CIP

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Selective liquid phase oxidation of cyclohexane over Pt/CeO_(2)-ZrO_(2)-SnO_(2)/SiO_(2)catalysts with molecular oxygen

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Journal of Advanced Ceramics 2015年第2期4卷 111-117页

作者： Nobuhito IMANAKA Toshiyuki MASUI kazuya JYOKO Department of Applied Chemistry Faculty of EngineeringOsaka University2-1 YamadaokaSuitaOsaka 565-0871Japan

Partial oxidation of cyclohexane into cyclohexanone and cyclohexanol(KA-oil)is an industrially significant reaction for producing precursors for the synthesis ofε-caprolactam and adipic acid,which are the building blocks of ***,to date,the cyclohexane conversion ratio has usually been limited to less than 6%to prevent further oxidation of the cyclohexanol and cyclohexanone *** this study,we report that Pt/CeO_(2)-ZrO_(2)-SnO_(2)/SiO_(2),in which CeO2-ZrO2-SnO2 provide reactive oxygen molecules from inside the bulk,can act as efficient *** of the catalyst composition and reaction conditions provided a cyclohexane conversion ratio of 24.1%and a total selectivity for cyclohexanol and cyclohexanone of 83.4%at 130℃in 0.5 MPa(4.9 atm)air for 7 h over a 5wt%Pt/16wt%Ce_(0.68)Zr_(0.17)Sn_(0.15)O_(2.0)/SiO_(2)*** catalyst has significant advantages over conventional catalysts because the reaction proceeds at a lower pressure,and there is no need for toxic radical initiators or free-radical scavengers.

关键词： composite materials oxidation cyclohexane KA-oil catalyst

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Effect of FeO concentration in sinter iron ore on reduction behavior in a hydrogen-enriched blast furnace

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International Journal of Minerals,Metallurgy and Materials 2022年第10期29卷 1820-1829页

作者： Ko-ichiro Ohno Takayuki Maeda kazuya Kunitomo Masashi Hara Department of Materials Faculty of EngineeringKyushu University744 MotookaNishi-kuFukuoka 819-0395Japan Kashima Area East Nippon WorksNippon Steel Corporation3 HikariKashima CityIbaraki 314-0014Japan

Japan started the national project“COURSE 50”for CO_(2) reduction in the *** project aimed to establish novel technologies to reduce CO_(2) emissions with partially utilization of hydrogen in blast furnace-based ironmaking by 30%by around 2030 and use it for practical applications by *** idea is that instead of coke,hydrogen is used as the reducing agent,leading to lower fossil fuel consumption in the *** has been reported that the reduction behavior of hematite,magnetite,calcium ferrite,and slag in the sinter is different,and it is also considerably influenced by the sinter *** study aimed to investigate the reduction behavior of sinters in hydrogen enriched blast furnace with different mineral morphologies in CO-CO_(2)-H2 mixed *** an experimental sample,two sinter samples with significantly different hematite and magnetite ratios were prepared to compare their reduction *** reduction of wustite to iron was carried out at 1000,900,and 800℃ in a CO-CO_(2)-H2 atmosphere for the mineral morphology-controlled sinter,and the following findings were *** reduction rate of smaller amount of FeO led to faster increase of the reduction rate curve at the initial stage of ***-observations of reduced samples showed that the reaction proceeded from the outer periphery of the sample toward the inside,and a reaction interface was observed where reduced iron and wustite ***-observations revealed three layers,namely,wustite single phase in the center zone of the sample,iron single phase in the outer periphery zone of the sample,and iron oxide-derived wustite FeO and iron,or calcium ferritederived wustite'FeO'and iron in the reaction interface zone.A two-interface unreacted core model was successfully applied for the kinetic analysis of the reduction reaction,and obtained temperature dependent expressions of the chemical reaction coefficients from each mineral phases.

关键词： hydrogen reduction wustite hematite magnetite calcium ferrite two-interface unreacted core model COURSE50

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The Role and the Function of Japan Institute of Sports Sciences and National Training Center in Japan

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中国体育科技 2009年第1期45卷 30-32页

作者： kazuya Kasahara Japan Institute of Sports Sciences Japan

Gold Medals in Summer Qlympics Measures A 1) Program to develop junior athletes to top level 2) National Training Center 3) National Coach Academy B 1) Sports medicine and sciences(JISS) 2) Anti-doping 3) To hold inte... 详细信息

关键词： The Role and the Function of Japan Institute of Sports Sciences and National Training Center in Japan

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Effects of crystallinity, {001}/{101} ratio, and Au decoration on the photocatalytic activity of anatase TiO_2 crystals

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Chinese Journal of Catalysis 2019年第3期40卷 403-412页

作者： Jiangyan Wang Baoshun Liu kazuya Nakata State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan 430070 Hubei China Research Institute for Science and Technology Photocatalysis International Research Center Tokyo University of Science 2641 Yamazaki Noda Chiba 278-8510 Japan Science and Technology Tokyo University of Science 2641 Yamazaki Noda Chiba 278-8510 Japan

Anatase TiO2 nanocrystals and sub-microcrystals with truncated octahedral bipyramidal morphologies were prepared by direct calcination of TiOF2 precursors. The as-prepared TiO2 samples were thoroughly characterized by X-ray diffraction, Raman spectroscopy, field-emission scanning electron microscopy, N2 adsorption-desorption isotherms, X-ray photoelectron spectroscopy, and UV-visible diffuse spectroscopy. It was found that the crystallinity, grain size, and {001}/{101} ratio of the samples can be increased by raising the calcination temperature from 500 to 800℃. The higher crystallinity and {001}/{101} facet ratio resulted in an increase in both aqueous and gas-phase photocatalytic activities, by inhibiting the recombination and separation of electrons and holes. After selecting two TiO2 samples with high crystallinity and {001}/{101} ratio, Au nanoparticles were decorated on their surfaces, and the photocatalytic activity of the resulting samples under visible light illumination was studied. It was found that the visible light-induced photocatalytic activity increased by 2.6 and 4.8 times, respectively, upon Au decoration of the samples prepared by calcination of TiOF2 at 700 and 800℃.

关键词： High crystallinity Anatase TiO2 High energy facets Au decoration Photocatalysis

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Covariant spin kinetic theory I:collisionless limit

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Chinese Physics C 2020年第9期44卷 83-94页

作者： Yu-Chen Liu kazuya Mameda Xu-Guang Huang Physics Department and Center for Particle Physics and Field Theory Fudan UniversityShanghai 200433China RIKEN Nishina Center for Accelerator-Based Science Wako 351-0198Japan Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Fudan UniversityShanghai 200433China

We develop a covariant kinetic theory for massive fermions in a curved spacetime and an external electromagnetic field based on quantum field *** derive four coupled semi-classical kinetic equations accurate to O(ℏ),which describe the transports of particle number and spin degrees of *** relationship with chiral kinetic theory is *** an application,we study spin polarization in the presence of finite Riemann curvature and an electromagnetic field in both local and global equilibrium states.

关键词： quantum kinetic theory quantum fields in curved spacetime relativistic heavy-ion collisions

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Adsorption of urea,creatinine,and uric acid from three solution types using spherical activated carbon and its recyclability

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Chinese Journal of Chemical Engineering 2020年第12期28卷 2993-3001页

作者： Tomohito Kameda kazuya Horikoshi Shogo Kumagai Yuko Saito Toshiaki Yoshioka Graduate School of Environmental Studies Tohoku University6-6-07 AobaAramakiAoba-kuSendai 980-8579Japan

In this paper,we propose that the urinary toxins from the wastewater be adsorbed on an adsorbent such as spherical activated carbon and the latter be regenerated by subjecting it to high temperatures to recycle activated carbon and also to recycle the water used in *** studied the adsorption of artificial waste dialysate,which is a mixed solution of urea,creatinine,and uric acid,and the separate solutions for each of these and found that their extents of adsorption onto the spherical activated carbon material were nearly *** amount of adsorption was approximately 1.4 mg·g^−1 for urea,18 mg·g^−1 for creatinine,and 20 mg·g^−1 for uric *** urea,creatinine,and uric acid adsorbed onto the spherical activated carbon decomposed on heat treatment at 500℃,and the adsorption capacity of the spherical activated carbon was *** study successfully demonstrated that the spherical activated carbon can be recycled in the waste dialysate treatment process.

关键词： Adsorption Dialysate Spherical activated carbon Recycling

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