Language：Japanese   Publisher：Japan Association of Zeolite  

To develop an efficient removal process for sulfur species in natural gas and city gas, we investigated the direct decomposition reactions of TBM ((CH3)3CSH) and DMS (CH3SCH3) using zeolite. H-FAU and H-Beta zeolite was effective in direct decomposition of TBM, and showed stable activity even at 150°C. In addition, the reaction mechanism revealed that large pores with three-dimensional channels were important for the TBM decomposition. On the other hand, in direct DMS decomposition, transition metal cation modification onto an H-Beta zeolite was effective, and the reaction temperature could be significantly lowered by the Co ion modification. We have shown that organic sulfur compounds can be efficiently converted by controlling the pore structure and acid properties of zeolite.

DOI： 10.20731/zeoraito.41.2.64

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

The increasing sulfur content in fossil fuels and the use of biogas as a renewable energy source has highlighted the need for effective desulfurization processes. To remove sulfur species from gaseous resources efficiently, a catalytic process that can convert sulfur compounds to hydrogen sulfide (H2S) at low temperatures is desirable. In this study, electric-field-assisted catalytic methanethiol (CH3SH) decomposition was performed to develop a new system for converting sulfur compounds to H2S at low temperatures. In the thermal catalytic reaction using the Pt/CeO2 catalyst, dimethyl sulfide, which is a byproduct of the reaction, is formed. Compared with the result, applying an electric field suppressed the side reaction. The CH4 and H2S formation rates slightly improved by applying the electric field, suggesting the possibility of controlling the CH3SH decomposition products.

DOI： 10.1007/s10562-023-04416-w

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DOI： https://doi.org/10.1016/j.compositesa.2023.107991

Repository Public URL： https://hdl.handle.net/2324/7164814

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1080/00219592.2023.2301533

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1007/s10562-023-04416-w

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1627/jpi.67.30

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1016/j.cej.2023.148241

Repository Public URL： https://hdl.handle.net/2324/7164803

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1080/00219592.2023.2212703

Repository Public URL： https://hdl.handle.net/2324/7164801

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1016/j.ijhydene.2023.04.052

Repository Public URL： https://hdl.handle.net/2324/7164800

Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press (OUP)  

This study clarifies the thermal reactivity of CH3SH to form ethylene (C2H4), CH4, and CS2. The yield of ethylene was relatively higher (approximately 40%) with 50% selectivity. The long-term reaction characteristics were evaluated to explore the possibility of continuous ethylene production, suggesting that C2H4 was stably obtained for more than 100 h.

DOI： 10.1246/cl.230228

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Language：English   Publisher：Royal Society of Chemistry (RSC)  

The catalytic properties of conventional H-[Al]-ZSM-5 and gallium-substituted H-[Ga]-ZSM-5 were evaluated in the conversion of methanethiol to ethylene (CH_3SH → 1/2C_2H_4 + H_2S). Dimethyl sulfide (DMS), aromatics, and CH_4 were formed as byproducts on the H-[Al]-ZSM-5 catalyst. The introduction of Ga into the ZSM-5 structure provided a high ethylene yield with relatively high selectivity for olefins. Based on the temperature-programmed desorption of NH_3 and pyridine adsorption on zeolites, the strength of acid sites was decreased by introducing Ga into the ZSM-5 structure. Undesirable reactions seemed less likely to occur at weakly acidic sites. The suppression of the formation of dimethyl sulfide (CH_3SH → 1/2C_2H_6S + 1/2H_2S) and the sequential reaction of ethylene to produce aromatics provided a high yield of ethylene over H-[Ga]-ZSM-5.

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Informa UK Limited  

The feedstock recycling of carbon fiber reinforced plastics (CFRPs) is typically conducted by either thermal decomposition or dissolution methods for resin separation. A common issue in the recycling processes is that neither oxygen nor solvents can easily penetrate dense CFRP; therefore, penetrating diffusion paths such as voids is expected to improve the separation efficiency. This study presents voids formation characteristics by low-temperature annealing as pre-treatment in typical epoxy-based cross-ply CFRP laminates. The void characteristics were evaluated by electrical treatment and observations after the annealing in the air or N-2 atmosphere. Annealing in air resulted primarily in ply delamination and matrix cracking through slight oxidative reactions. By contrast, annealing in the N-2 atmosphere denatured the epoxy resin, resulting in the formation of voids and swelling that reached the interior of the specimens. The void characteristics could be controlled by the atmosphere in the low-temperature annealing, leading to the penetrating diffusion paths.

DOI： 10.1080/09243046.2022.2121228

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DOI： https://doi.org/10.1039/D3RA01852K

Repository Public URL： https://hdl.handle.net/2324/7164799

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1246/cl.230228

Repository Public URL： https://hdl.handle.net/2324/7164798

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ROYAL SOC CHEMISTRY  

This study investigates the effect of hydrogen sulfide (H_2S) co-feeding on the synthesis of 2,5-dimethyl-1-hexene, 2,5-dimethyl-2-hexene, and 2,5-dimethylhexane (2,5-DMHs), useful compounds, using the dimerization of isobutene under mild pressure conditions. The dimerization of isobutene did not proceed in the absence of H_2S, whereas the desired products of 2,5-DMHs were produced under H_2S co-feeding conditions. The effect of reactor size on the dimerization reaction was then examined, and the optimal reactor was discussed. To enhance the yield of 2,5-DMHs, we changed the reaction conditions of the temperature, molar ratio of isobutene to H_2S (iso-C_4^=/H_2S) in the feed gas, and the total feed pressure. The optimum reaction condition was at 375 °C and 2/1 of iso-C_4^=/H_2S. The product of 2,5-DMHs monotonously increased by an increment of total pressure from 1.0 to 3.0 atm with a fixed iso-C_4^H_2S ratio at 2/1.

DOI： 10.1039/d3ra01324c

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Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1039/D3RA01324C

Repository Public URL： https://hdl.handle.net/2324/7164797

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ROYAL SOC CHEMISTRY  

This study focused on evaluating the catalytic properties for the reverse water gas shift reaction (RWGS: CO_2 + H_2 → CO + H_2O ΔH^0 = 42.1 kJ mol^<−1>) in the presence of hydrogen sulfide (H_2S) over a Fe/CeO_2 catalyst, commercial Cu–Zn catalyst for the WGS reaction (MDC-7), and Co–Mo catalyst for hydrocarbon desulfurization. The Fe/CeO_2 catalyst exhibited a relatively high catalytic activity to RWGS, compared to the commercial MDC-7 and Co–Mo catalysts. In addition, the Fe/CeO_2 catalyst showed stable performance in the RWGS environment that contained high concentrations of H_2S. The role of co-feeding H_2S was investigated over the Fe/CeO_2 catalyst by the temperature programmed reaction (TPR) of CO_2 and H_2 in the presence of H_2S. The result of TPR indicated that the co-feeding H_2S might enhance RWGS performance due to H_2S acting as the hydrogen source to reduce CO_2.

DOI： 10.1039/d3ra01323e

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Publishing type：Research paper (scientific journal)   Publisher：Journal of Condensed Matter Nuclear Science  

In this work, the phenomenon of long-term heat generation from Pd-Ni-Zr (PNZ) alloy samples in hydrogen was investigated using differential scanning calorimetry (DSC). As a result, we succeeded in observing sustained heat generation when the PNZ sample was maintained at temperatures in the 300–500◦C range. The fact that the DSC confirmed sustained heat generation over a short period of time is very significant. This is because repeated measurements over a short period of time provide more information about sustained heat generation. The relationship between sustained heat generation and hydrogen absorption behavior was examined in detail. No sustained heat generation occurred at temperatures at which the hydrogen was absorbed, while sustained heat generation occurred at the temperatures at which hydrogen was desorbed. The output of sustained heat generation decreased as the hydrogen pressure was increased. These results indicate that sustained heat generation is different from the heat of hydrogen storage. It was also found that sustained heat generation can be observed when the temperature is kept constant in the temperature range where hydrogen is being desorbed. In addition, the results of the alloy phase changes of PNZs when heat-treated in hydrogen suggested that the contribution of the alloy phase transition heat to sustained heat generation was small. Thus, it became clear that sustained heat generation in PNZs was not due to the heat of hydrogen storage, and it was suggested that the contribution of the alloy phase transition heat was small.

DOI： 10.70923/001c.124623

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：PERGAMON-ELSEVIER SCIENCE LTD  

To improve the catalytic activity of Pt catalysts for methylcyclohexane (MCH) dehydrogenation, which is utilized for hydrogen transportation, the effects of the addition of Se on the performance of Pt/TiO2 catalysts were investigated. In Se/Pt/TiO2 catalysts, even a small amount of Se addition (Se/Pt = 0.01) improved the catalyst stability. Se was highly dispersed on the Pt/TiO2 surface, without volatilizing in a reducing atmosphere at temperatures below 450 °C, and did not form an alloy with Pt. The analysis of adsorption-desorption characteristics revealed that the addition of Se promoted the desorption of products, including the main product, toluene. Moreover, an electron donation effect from Se to Pt was observed by FT-IR measurement after the reduction. The desorption characteristic caused by the electron donation effect suppressed the deterioration of the catalyst and allowed stable catalytic activity toward the MCH dehydrogenation reaction.

DOI： 10.1016/j.ijhydene.2022.09.055

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Repository Public URL： https://hdl.handle.net/2324/7164791

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

Rh metal particles supported on TiO₂ could reduce Se(vi) to Se(0) in aqueous solution. Although a hydrazine reductant caused deactivation due to covering, a formaldehyde reductant led to a stable reaction due to deposition in isolation.

DOI： 10.1039/d2ra02889a

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Language：English   Publisher：Royal Society of Chemistry (RSC)  

To remove arsenite (As(III)) from wastewater effectively, the catalytic oxidation of As(III) to arsenate (As(V)) and As(V) precipitation with iron ions (Fe(III)) was investigated. The Pt/SiO_2 catalyst functioned as a reaction site for As(III) with oxygen in the atmosphere. The combination of the Pt/SiO_2 catalyst and Fe(III) precipitant improved the removal of As(III) in the precipitate; Pt/SiO_2 worked as both an As(III) oxidation site and precipitation site with Fe(III) precipitant.

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

Repository Public URL： https://hdl.handle.net/2324/7161322

Language：English   Publishing type：Research paper (scientific journal)  

Repository Public URL： https://hdl.handle.net/2324/7164771

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

A supported ruthenium catalyst (Ru/Cs+/CeO2) for ammonia synthesis is described which incorporates a large amount of a Cs+ promoter in a porous CeO2 support to enhance the electron donation effect of the alkali promoter on the ruthenium catalyst. Optimization of the Ru and Cs+ promoter contents improves the ammonia synthesis rate to more than 4 times that of the benchmark catalyst (Cs+/Ru/MgO) at 350 degrees C and 0.1 MPa, and the ammonia synthesis rate is stable for 100 h. Introduction of the Cs+ promoter into the support before the Ru impregnation increases the particle size of the Ru catalyst. Despite a decrease in the number of active sites, the TOF of the catalyst is more than 50 times that of Ru (2 wt%)/CeO2. CO adsorption measurements suggest an electron donating effect by the Cs+ promoter to ruthenium metal. Reaction order analysis indicates this is due to a mitigation of hydrogen poisoning. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.ijhydene.2021.10.204

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Repository Public URL： https://hdl.handle.net/2324/7164769

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jcat.2021.06.016

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1039/d1dt00501d

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1039/D1CY00289A

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1021/acs.jpcc.0c10917

Language：Others   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.micromeso.2020.110743

Language：Others   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.seppur.2020.117296

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1627/jpi.63.388

Language：Others   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.ijhydene.2020.07.106

Language：Others   Publishing type：Research paper (scientific journal)  

DOI： 10.1021/acs.iecr.0c02152

Language：Others   Publishing type：Research paper (scientific journal)  

DOI： 10.1627/jpi.63.89

Language：English   Publishing type：Research paper (scientific journal)  

Effect of annealing on the separation of resin from CFRP cross-ply laminate via electrical treatment
© 2019 Elsevier Ltd Carbon fiber reinforced plastics (CFRP) are desirable owing to their high specific strength and rigidity. Traditional recycling methods for these products such as thermal decomposition cause considerable damage to the carbon fibers. In search for better recycling methods, we explored the use of electrical treatment for the separation of resin. Herein, we investigated the effects of annealing on the separation of resin from a CFRP cross-ply laminate molded from unidirectional prepreg (carbon fiber/epoxy) using electrical treatment. The annealing of the CFRP cross-ply laminate [0°/90°]2s was performed at temperatures ranging from 60 °C to 450 °C, followed by the electrical treatment. Experimental results demonstrated that the separation of resin, without the carbon fiber damage, could be achieved by annealing at temperatures close to the epoxy decomposition temperature. For the non-annealed CFRP specimens, the separation of resin was achieved with considerable damage to the carbon fibers.

DOI： 10.1016/j.compstruct.2019.111665

Language：Others  

Rapid removal of resin from a unidirectional carbon fiber reinforced plastic laminate by a high-voltage electrical treatment
© 2019 Elsevier B.V. Removal of epoxy resin from a unidirectional carbon fiber reinforced plastic (CFRP) laminate was achieved with an electrical treatment. The treatment was carried out using a two-electrode cell with the CFRP laminate as the anode, and the effect of applying a high voltage was investigated to reduce the treatment time. The results showed that a high voltage in the electrical treatment leads to high weight loss of the unidirectional CFRP laminate. In the digital microscope images of the residue obtained from the electrolyte after the treatment, fragments assumed to be resin were observed. The removal mechanism involved an electrochemical reaction; however, no decomposition product related to the resin was detected in the electrolyte after the treatment. The results supposed that the removal mechanism of the electrical treatment involved peeling off the resin by gas generated by water electrolysis.

DOI： 10.1016/j.seppur.2019.115885

Language：English   Publishing type：Research paper (scientific journal)  

Effects of Cu Precursor Type on the Catalytic Activity of Cu/ZrO2 towards Methanol Synthesis via CO2 Hydrogenation

DOI： 10.1021/acs.iecr.9b03627

Language：English   Publishing type：Research paper (scientific journal)  

Dry reforming of methane (DRM) was conducted over various transition metal supported ZrO2 catalysts in an electric field. Catalyst of lwt%Ni/10 mol%La-ZrO2 showed high DRM activity even at 423 K of external temperature, at which no DRM proceeds in the conventional catalytic systems. By virtue of the low reaction temperature, low amounts of carbon deposition were confirmed even in conditions of high CH4 conversion in the electric field. The imposed electric power was correlated to with the catalytic activities in the electric field. Syngas is producible at low temperature with high energy efficiency. (C) 2016 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.fuproc.2016.11.013

Language：English   Publishing type：Research paper (scientific journal)  

Catalytic steam reforming of methane for hydrogen production proceeds even at 473 K over 1 wt% Pd/CeO2 catalyst in an electric field, thanks to the surface protonics. Kinetic analyses demonstrated the synergetic effect between catalytic reaction and electric field, revealing strengthened water pressure dependence of the reaction rate when applying an electric field, with one-third the apparent activation energy at the lower reaction temperature range. Operando-IR measurements revealed that proton conduction via adsorbed water on the catalyst surface occurred during electric field application. Methane was activated by proton collision at the Pd-CeO2 interface, based on the inverse kinetic isotope effect. Proton conduction on the catalyst surface plays an important role in methane activation at low temperature. This report is the first describing promotion of the catalytic reaction by surface protonics.

DOI： 10.1038/srep38007

Language：Japanese  

Language：English   Publishing type：Research paper (scientific journal)  

Catalytic water gas shift for hydrogen production in the temperature range of 423-873 K, was examined imposing an electric field to the catalyst bed. Reaction trends were investigated based on thermodynamic equilibrium and chemical kinetic law. Pt/La-ZrO2 was chosen as an active catalyst through our screening tests, and the effect of the electric field on the catalytic activity was investigated by changing reaction temperatures and applied electric currents. Although the reaction was ruled by thermodynamic equilibrium at high temperatures, drastic promotion of the reaction by applying the electric field was observed at low temperatures in a kinetic region. Drastic decrease of apparent activation energy for WGS was observed by imposing the electric field to the catalyst bed. Various isotopic transient tests revealed that the reaction mechanism changed by the application of electric field, and redox mechanism using surface lattice oxygen played an important role in case of the catalytic WGS in the electric field.
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DOI： 10.1007/s10562-016-1765-y

Language：English   Publishing type：Research paper (scientific journal)  

Catalytic reverse water gas shift reaction was conducted in an electric field (denoted as E-RWGS) over various catalysts at low temperature as 423 K. A platinum catalyst supported on lanthanum doped zirconia (Pt/La-Zr02) showed the highest yield (ca. 40%) for the E-RWGS reaction even at such low temperature condition. In contrast to a bare oxide catalyst, metal loading catalysts showed higher activities and efficiencies for the reaction. Roles of the impregnated platinum and doped lanthanum on the catalytic activity were investigated, and we found that loaded platinum worked as an active site for the E-RWGS reaction, and La doping stabilized the structure of Zr02. The effect of the electric field was discussed based on thermodynamic evaluation and experimental results. C) 2013 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.cattod.2013.11.035

Language：English   Publishing type：Research paper (scientific journal)  

Oxidative coupling of methane using carbon dioxide (CO2-OCM) as an oxidant was conducted over several La- and Zr-based catalysts in an electric field at low external temperature of 423 K. Higher catalytic activity was obtained than in a conventional catalytic reaction over 10 mol% lanthanum-doped zirconia (La-ZrO2) in the electric field. Although the catalytic activity for the CO2-OCM was low over the La-ZrO2 at 1173 K without the application of the electric field, the electric field promoted catalytic activity even at 423 K external temperature. We optimized the amount of doping-La in the La-ZrO2 system, and characterized the effect of doping-La with XRD measurement. From these examinations, 5 mol% La-ZrO2 catalyst showed the highest activity. High catalytic activity was provided by the synergistic effect of the La- cation, tetragonal-ZrO2, and the electric field. (c) 2013 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.fuel.2013.01.058

Language：English   Publishing type：Research paper (scientific journal)  

Catalytic steam reforming of methane in an electric field (electroreforming) at low temperatures such as 423 K was investigated. Pt catalysts supported on CeO2, CexZr1-xO2 solid solution and a physical mixture of CeO2 and other insulators (ZrO2, Al2O3 or SiO2) were used for electroreforming. Among these catalysts, Pt catalyst supported on CexZr1-xO2 solid solution showed the highest activity for electroreforming (CH4 conv. = 40.6% at 535.1 K). Results show that the interaction among the electrons, metal loading, and catalyst support was important for high catalytic activity on the electroreforming. Catalytic activity of the electroreforming increased in direct relation to the input current. Characterizations using X-ray diffraction (XRD), temperature programmed reduction with H-2 (H-2-TPR), and alternate current (AC) impedance measurement show that the catalyst structure is an important factor for activity of electroreforming. Copyright (c) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.ijhydene.2012.12.069

Language：English   Publishing type：Research paper (scientific journal)  

Direct conversion of methane to other valuable products such as ethylene, methanol, benzene, carbon, hydrogen, and syngas has been widely investigated. Such conversion requires high temperatures because of the strong C-H bond in CH4, and such high-temperature reactions present various problems: sequential reaction to decrease the selectivity to target products, need for multiple heat exchangers to use or recover high-temperature waste heat, materials that are stable at high temperatures, etc. To solve these problems, several trials have been undertaken to lower reaction temperatures using plasma, Non-Faradaic Electrochemical Modification of Catalytic Activity (NEMCA), and electric fields. This review describes recent trends in methane conversion, and describes our methods to lower the reaction temperature.

DOI： 10.1627/jpi.56.11

Language：English   Publishing type：Research paper (scientific journal)  

Oxidative coupling of methane (OCM) on La2O3 semiconductor catalysts at 423 K external temperature was investigated. DC power supplied from two electrodes in a catalyst bed enabled stable and selective production of C2H6 and C2H4 over Sr-La2O3 (Sr/La = 1/200 and 1/20), but plasma reactions proceeded over other catalysts. The electrical conductivity of the semiconductor catalyst was important for controlling this reaction. A high yield of C2 (49% selectivity, 51.3% O-2 conversion) was obtained using 2.7 W of electricity at a lower external temperature (423 K).

DOI： 10.1246/cl.2012.351

Event date： 2023.11

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Venue：奄美   Country：Japan  

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Venue：大阪   Country：Japan  

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Venue：大阪   Country：Japan  

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Venue：高松   Country：Japan  

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Venue：福岡   Country：Japan  

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Venue：Pasay   Country：Philippines  

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Venue：Portorož-Portorose   Country：Slovenia  

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Venue：東京   Country：Japan  

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Venue：東京   Country：Japan  

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Venue：東京   Country：Japan  

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Venue：東京   Country：Japan  

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Venue：東京   Country：Japan  

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Venue：福岡(オンライン)   Country：Japan  

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Venue：富山   Country：Japan  

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Venue：Fukuoka   Country：Japan  

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Venue：Osaka（Online）   Country：Japan  

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Venue：岡山(オンライン)   Country：Japan  

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Venue：岡山(オンライン)   Country：Japan  

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Venue：岡山(オンライン)   Country：Japan  

Event date： 2021.9

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Venue：岡山(オンライン)   Country：Japan  

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Venue：岡山(オンライン)   Country：Japan  

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Venue：岡山(オンライン)   Country：Japan  

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Venue：Sapporo   Country：Japan  

Event date： 2021.6

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Venue：Taipei   Country：Taiwan, Province of China  

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Venue：Yokohama   Country：Japan  

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Venue：Perth   Country：Australia  

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Venue：Perth   Country：Australia  

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Venue：Sapporo   Country：Japan  

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Venue：Taipei   Country：Taiwan, Province of China  

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Venue：Fukuoka   Country：Japan  

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Venue：長野   Country：Japan  

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Venue：長野   Country：Japan  

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Venue：東京   Country：Japan  

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Venue：Seoul   Country：Japan  

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Presentation type：Oral presentation (invited, special)  

researchmap

researchmap

researchmap

researchmap