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Synthesis of bulk lanthanum polyphosphate and other rare earth phosphates through hydrothermal hot-pressing

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Journal of Advanced Ceramics 2013年第4期2卷 301-307页

作者： Hiroaki ONODA taro YAMASAKI Department of Informatics and Environmental Sciences Faculty of Life and Environmental SciencesKyoto Prefectural University1-5Shimogamo Nakaragi-choSakyo-kuKyoto 606-8522Japan

Bulk samples of lanthanum polyphosphate were synthesized through a hydrothermal hot-pressing(HHP)*** this process,pressing temperature,pressure and volume of water were varied in order to improve the density and strength of the resulting *** strength of the bulk samples was estimated through drilling and ultrasonic *** order to improve the strength of the materials,the use of microwave irradiation was *** polyphosphate formed porous bulk samples with a filling factor of approximately 70%,which was calculated from real and theoretical *** respect to machinable strength,a drilled hole greater than 7.0 mm in diameter was obtained on some bulk samples,and the diameter of the samples was 14 *** HHP process is a useful method for obtaining bulk samples of lanthanum *** lanthanum polyphosphate containing water crumbled easily to a powder form upon ***,these bulk samples retained their shape upon ultrasonication,despite containing water,after exposure to microwave irradiation,and also experienced minimal weight ***,to study the effect of microwave heating,bulk lanthanum orthophosphate,yttrium orthophosphate and polyphosphate were also examined.

关键词： lanthanum polyphosphate hydrothermal hot-pressing(HHP)process machinable strength vibration strength microwave heating

Formation and Annealing of BaTiO_3 and SrTiO_3 Nanoparticles in KOH Solution

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Journal of Materials Science & Technology 2010年第1期26卷 33-38页

作者： Tomoki Tsumura Keiichi Matsuoka Masahiro toyoda Department of Applied Chemistry Faculty of EngineeringOita University

Barium titanate （BaTiO3） and strontium titanate （SrTiO3） nanoparticles were synthesized separately through hydrothermal reaction of crystalline TiO2 particles and corresponding alkaline earth hydroxides, Ba（OH）2 and St（OH）2 respectively, in 50 mol·dm^-3 KOH solution at 150℃. Each structural evolution of BaTiO3 and SrTiO3 during the hydrothermal treatment was investigated by X-ray diffraction （XRD）, field emission scanning electron microscopy （FE-SEM）, field emission transmission electron microscopy （FE-TEM） and thermogravimetry- differential analysis （TG-DTA）. In the BaTiO3 system, round particles with cubic perovskite-type structure were obtained within 1 h. However, these particles were gradually dissolved and then were re-precipitated in the form of cube-shape BaTiO3 particles with a smaller lattice constant ac than that of the former phase. After the BaTiO3 particles formed firstly have disappeared completely, or the two phases coexistence stage with different lattice constant ac passed, lattice constant ac of BaTiO3 phase re-precipitated continuously decreased with annealing time. In contrast, once SrTiO3 particles are formed, the lattice constant ac decreased continuously throughout the reaction. The result indicates that SrTiO3 particles were annealed without dissolution and precipitation process under the present condition.

关键词： BaTiO3 SrTiO3 Nanoparticle Hydrothermal reaction

A new algorithm based on metaheuristics for data clustering

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第12期11卷 921-926页

作者： Tsutomu SHOHDOHJI Fumihiko YANO Yoshiaki toyoda Department of Computer and Information Engineering Faculty of EngineeringNippon Institute of Technology Division of Integrated Sciences J.F.Oberlin University Aoyama Gakuin University

This paper presents a new algorithm for clustering a large amount of *** improved the ant colony clustering algorithm that uses an ant’s swarm intelligence,and tried to overcome the weakness of the classical cluster analysis *** our proposed algorithm,improvements in the efficiency of an agent operation were achieved,and a new function "cluster condensation" was *** proposed algorithm is a processing method by which a cluster size is reduced by uniting similar objects and incorporating them into the cluster *** with classical cluster analysis methods,the number of steps required to complete the clustering can be suppressed to 1% or less by performing this procedure,and the dispersion of the result can also be ***,our clustering algorithm has the advantage of being possible even in a small-field cluster *** addition,the number of objects that exist in the field decreases because the cluster condenses;therefore,it becomes possible to add an object to a space that has become *** other words,first,the majority of data is put on *** are then clustered,gradually adding parts of the standby data to the clustering *** method can be adopted for a large amount of *** experiments confirmed that our proposed algorithm can theoretically applied to an unrestricted volume of data.

关键词： Metaheuristics Ant colony clustering Data clustering Swarm intelligence

Nonequilibrium molecular dynamics for accelerated computation of ion–ion correlated conductivity beyond Nernst–Einstein limitation

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npj Computational Materials 2023年第1期9卷 1796-1803页

作者： Ryoma Sasaki Bo Gao taro Hitosugi Yoshitaka Tateyama School of Materials and Chemical Technology Tokyo Institute of Technology2-12-1 OokayamaMeguroTokyo 152-8552Japan Center for Green Research on Energy and Environmental Materials National Institute for Material Science1-1 NamikiTsukubaIbaraki 305-0044Japan Department of Chemistry The University of Tokyo7-3-1 HongoBunkyoTokyo 113-0033Japan

Condensed matters with high ionic conductivities are crucial in various solid devices such as solid-state batteries. The conduction ischaracterized by the cooperative ionic motion associated with the high carrier density. However, the high cost of computingcorrelated ionic conductivities has forced almost all ab initio molecular dynamics (MD) to rely on the Nernst–Einstein dilute-solutionapproximation, which ignores the cross-correlation effect. Here we develop a chemical color-diffusion nonequilibrium MD (CCD-NEMD) method, which enables to calculate the correlated conductivities with fewer sampling steps than the conventional MD. ThisCCD-NEMD is demonstrated to well evaluate the conductivities in the representative solid electrolyte bulk Li10GeP2S12 andLi_(7)La_(3)Zr_(2)O_(12). We also applied CCD-NEMD to the grain boundary of Li_(7)La_(3)Zr_(2)O_(12) and demonstrated its applicability for calculatinginterfacial local conductivities, which is essential for investigating grain boundaries and composite electrolytes. CCD-NEMD canprovide further accurate understanding of ionics with ionic correlations and promote developing solid devices.

关键词： dynamics Nernst steps

Biodegradation of trace pharmaceutical substances in wastewater by a membrane bioreactor

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Frontiers of Environmental Science & Engineering 2009年第2期3卷 236-240页

作者： Longli BO taro URASE Xiaochang WANG School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Department of Civil Engineering Tokyo Institute of TechnologyTokyo 152-8552Japan

The biodegradation of selected pharmaceutical micropollutants,including two pharmaceuticals with argued biodegradation,was studied by a lab-scale membrane *** reaction kinetics and affecting factors were also investigated in this *** acid(CA)with contradictive biodegradation reported was degraded almost completely at different hydraulic retention times(HRTs)after adaptation to *** biodegradation of CA was disturbed at low pH operation,while the activity of microorganisms recovered again after pH adjustment to neutral ***(IBP)degraded under neutral and acidic *** of IBP and CA were zero-order and first-order reactions under high and low initial concentrations,*** and diclofenac were not degraded regardless of HRTs and pH.

关键词： pharmaceuticals membrane bioreactor activated sludge reaction kinetics

Molecular mechanisms of transcription and replication of the influenza A virus genome

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Frontiers in Biology 2011年第6期6卷 446-461页

作者： Shijian ZHANG Tetsuya toyoda Shanghai Medical College of Fudan University Shanghai 200032China Choju Medical Institute Fukushimura Hospital19-14 AzanakayamaNoyori-choToyohashiAichi 441-8124Japan Infectious Disease Regulation Project Tokyo Metropolitan Institute of Medical Sciences1-6Kamikitazawa 2-chomeSetagaya-kuTokyo156-8506Japan

Influenza Avirus is one of the major pathogens that pose a large threat to human health worldwide and has caused *** A virus is the Orthomyxoviridae prototype,and has 8 segmented negative-sense singlestranded RNA(vRNA)as its *** virus RNA polymerase(RdRp)consists of three subunits PB2,PB1 and PA,and catalyzes both transcription and ***,intensive biochemical and structural analysis of its RdRp has been *** this paper,we review the details from the biochemical analysis of the purified influenza virus RdRp and the classical ribonucleoprotein complex,as well as piece together their structures to form an overall picture.

关键词： influenza virus RNA polymerase ribonucleoprotein complex transcription replication

Lensless Vanderlugt optical correlator using two phase-only spatial light modulators(Invited Paper)

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Chinese Optics Letters 2009年第12期7卷 1131-1133页

作者： Norihiro Fukuchi Takashi Inoue Haruyoshi toyoda Tsutomu Hara Central Research Laboratory Hamamatsu Photonics K.K.Hamamatsu 434-8601 Japan

A lensless Vanderlugt optical correlator using two phase-only spatial light modulators （SLMs） is proposed. The SLMs are used for displaying input and filter patterns respectively. The SLMs are also used as programmable lenses in order to realize the lensless construction. This lensless system is simple and its alignment adjustment is easy. The performance of the SLMs as programmable lenses is also described.

关键词： SLM Invited Paper FLPs Lensless Vanderlugt optical correlator using two phase-only spatial light modulators

Investigation and Improvement of the Staggered Labyrinth Seal

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Chinese Journal of Mechanical Engineering 2015年第2期28卷 402-408页

作者： LIN Zhirong WANG Xudong YUAN Xin SHIBUKAWA Naoki NOGUCHI taro Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Tsinghua University Toshiba Corporation Power Systems Company

Recent studies on staggered labyrinth seals have focused on the effects of different parameters,such as the pressure ratio and rotational speed on the leakage flow ***,few investigations pay sufficient attention to flow details and the sealing mechanism,which would be of practical importance in designing seals having higher *** paper establishes a theoretical model to study the seal mechanism,thus revealing that leakage is determined by the pressure ratio and geometric *** simulation is implemented to illustrate details of the flow field within the seal *** dissipation is used to quantitatively investigate the contribution that each location makes to the seal performance,revealing that orifices and stagnation points are the most important positions in the seal structure,generating the most *** orifice is carefully studied by using the theoretical *** for different pressure ratios are conducted and the results match well with those of the theoretical model and numerical simulation,verifying the theoretical model and analysis of the seal *** new designs,based on a good understanding of the seal mechanism,are presented,with one reducing leakage by 24.5%.

关键词： labyrinth seal numerical simulation viscous dissipation sealing mechanism

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