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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

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

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

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

Fabrication of MoSi_2-SiC Composites by a Spark Plasma Sintering Method

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International Journal of Minerals,Metallurgy and Materials 1999年第2期13卷 116-118页

作者： Kurokawa, kazuya Ube, Makoto Takahashi, Hideaki Takahashi, Heishichiro Division of Molecular Chemistry Graduate School of Engineering Hokkaido University Kita-ku Sapporo 060-8628 Kita-13 Nishi-8 Japan Center for Advanced Research of Energy Technology Hokkaido University Japan

MolybdenUmdisilicidepeoSi,)hashighmeltingpoint（2293K）,relativelylowdensity（6.249/cm3）,abrittle-to-ductiletemper;tabout1173K[l]andoutstandingoxidationresistance[2M].Forthisreason,thedisilicidematrixcompositesarebei... 详细信息

关键词： MoSi2-SiC composite spark plasma sintering in-siam Synthesis sintering behavior

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

WAVE PROPAGATION IN SATURATED GROUND USING THE VOLUME FRACTIONS

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Acta Mechanica Solida Sinica 1999年第2期12卷 144-154页

作者： kazuya Mitsuji Yoshihiro Sugimura Masanori Izumi Department of Architecture Faculty of EngineeringTohoku UniversitySendaiJapan

The purpose of this paper is to study the dynamic behavior of softground including a porous layer by considering porosity change. Inorder to take the porosity change into account, the concept of thevolume fraction, which has been proposed in continuum mechanics, isintroduced. The constitutive equations presented by Bowen are appliedto the analysis of the porous media. According to Bowen's theory, theporosity is considered as a variable called the volume fraction andhas its own consti- Tutive equation.

关键词： volume fraction wave propagation porosity change

Production of asexual and sexual offspring in the triploid sexual planarian Dugesia ryukyuensis

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Integrative Zoology 2009年第3期4卷 265-271页

作者： kazuya KOBAYASHI Sachiko ARIOKA Motonori HOSHI Midori MATSUMOTO Department of Biosciences and Informatics Keio UniversityYokohamaJapan

Certain freshwater planarians reproduce asexually as well as sexually,and their chromosomal ploidies include polyploidy,aneuploidy and ***,we successfully performed an experiment in which a clonal population produced by asexual reproduction of the Dugesia ryukyuensis(OH strain)switched to the sexual mode of *** of this strain are triploid with a pericentric inversion on Chromosome *** worms were switched to sexual reproduction after being fed with sexually mature Bdellocephala brunnea,which is a sexually reproducing *** resulting sexualized OH strain produced cocoons filled with several *** putative factors,Mendelian factor(s)and chromosomal control(s),have been proposed as determining the reproductive *** present study demonstrated that inbreeding of the resultant sexualized worms produced the following four types of offspring through sexual reproduction:diploid asexual worms,triploid asexual worms,diploid sexual worms and triploid sexual *** chromosomal mutation on Chromosome 4 was inherited by these offspring independent of their reproductive *** results provide two important pieces of information:(i)the putative genetic factor was not necessarily inherited in a Mendelian fashion;and(ii)the reproductive mode is not regulated by chromosomal changes such as polyploidy or chromosomal *** suggests that asexuality in *** is regulated by an unknown factor(s)other than a Mendelian factor or a chromosomal control.

关键词： asexuality Dugesia ryukyuensis planarian polyploidy reproductive mode.

A Blowdown Cryogenic Cavitation Tunnel and CFD Treatment for Flow Visualization around a Foil

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Journal of Thermal Science 2005年第4期14卷 346-351页

作者： Yutaka ITO kazuya SAWASAKI Naoki TANI Takao NAGASAKI Toshio NAGASHIMA Tokyo Institute of Technology G3-334259Nagatsuta-choMidori-kuYokohama226-8502Japan Honda Motor Co.Ltd. 2-1-1Minami-AoyamaMinato-kuTokyo107-8556Japan Japan Aerospace Exploration Agency 2-1-1SengenTsukuba305-8505Japan University of Tokyo 7-3-1HongoBunkyo-kuTokyo113-8656Japan

Cavitation is one of the major problems in the development of rocket engines. There have been few experimental studies to visualize cryogenic foil cavitation. Therefore a new cryogenic cavitation tunnel of blowdown type was built. The foil shape is “piano-convex”. This profile was chosen because of simplicity, but also of being similar to the one for a rocket inducer impeller. Working fluids were water at room temperature, hot water and liquid nitrogen. In case of Angle of Attack （AOA）=8°, periodical cavity departure was observed in the experiments of both water at 90℃ and nitrogen at -190℃ under the same velocity 10 m/sec and the same cavitation number 0.7. The frequencies were observed to be 110 and 90 Hz, respectively, and almost coincided with those of vortex shedding from the foil. Temperature depression due to the thermodynamic effect was confirmed in both experiment and simulation especially in the cryogenic cavitation.

关键词： cavitation tunnel cryogen CFD visualization simulation foil.

Electrochemical reduction of CO_2 and degradation of KHP on boron-doped diamond electrodes in a simultaneous and enhanced process

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Chinese Chemical Letters 2019年第2期30卷 509-512页

作者： Daibing Luo Shanhu Liu kazuya Nakata Akira Fujishima Analytical ξ Testing Center Sichuan University Research Institute for Science and Technology Photocatalysis International Research Center Tokyo University of Science Henan Key Laboratory of Polyxometalate Chemistry Institute of Molecular and Crystal Engineering College of Chemistry and Chemical EngineeringHenan University

In this research a novel electrochemical system using dual boron-doped diamond (BDD) electrodes as the anode and cathode, for the first time, has been developed for CO_2 conversion and wastewater treatment in a synergetic and simultaneous process. On the BDD cathode CO_2 is converted into formaldehyde while in the anodic side organic wastes are decomposed on the BDD anode. Interestingly, when potassium hydrogen phthalate (KHP) was used as the organic model to be degraded in the anodic side, a higher efficiency of formaldehyde generation from CO_2 was observed on the BDD cathode. The enhanced effect of formaldehyde formation in the presence of KHP oxidation suggests that this novel electrochemical system can combine conversion of CO_2 to the form of high-value chemicals and wastewater purification in a simultaneous and harmonious process.

关键词： CO2 Wlectrochemical reduction Boron-doped diamond Wastewater treatment Formaldehyde