Updated on 2021/04/30

写真a

 
NAKAMURA Maki
 
Organization
Institute of Materials and Systems for Sustainability Division of Materials Research (DM) Assistant Professor
Graduate School
Graduate School of Engineering
Title
Assistant Professor

Degree 1

  1. Dr. of Sic. ( 2013.3 ) 

Research History 4

  1. Nagoya University   Assistant Professor

    2020.4

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    Country:Japan

  2. Nagoya University

    2018.4 - 2020.3

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    Country:Japan

  3. Nagoya University

    2016.4 - 2018.3

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    Country:Japan

  4. Tokyo Institute of Technology

    2013.4 - 2016.3

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    Country:Japan

Professional Memberships 2

  1. 日本エアロゾル学会

    2020

  2. 自動車技術会

 

Papers 22

  1. 1次元モデルによる触媒付きディーゼル微粒子フィルターのPM堆積・酸化シミュレーション-触媒によるPM燃焼挙動の解析(第4報) Reviewed

    中村真季, 横田幸治, 小澤正邦

    自動車技術会論文集   Vol. 52 ( 2 ) page: 257 - 262   2021.2

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  2. Numerical calculation of PM trapping and oxidation of diesel particulate filter – Analysis of PM combustion behavior by a catalyst (Fourth Report) Reviewed

    Nakamura Maki, Yokota Koji, Ozawa Masakuni

    Transactions of Society of Automotive Engineers of Japan   Vol. 52 ( 2 ) page: 257 - 262   2021

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    Publishing type:Research paper (scientific journal)   Publisher:Society of Automotive Engineers of Japan  

    The particulate matter (PM) emitted from the diesel engine is collected and removed by the diesel particulate filter (DPF). When performing PM removal, it is necessary to raise the temperature of exhaust gas, so deterioration of fuel efficiency is a serious problem. Therefore, we aim to propose an optimal DPF structure with catalyst addition. In this study, PM combustion behavior inside the DPF when the catalyst is supported is carried out by numerical calculation. As a result, the effectiveness of the catalyst is recognized. It is found that there is a difference in the amount of PM combustion change according to the difference in the activation energy. In this result, it can be suggested that a catalyst having activation energy ΔE = 120 KJ/mol or less is effective. It is also possible to completely remove PM in a single regeneration by using a catalyst with low activation energy or by increasing the exhaust gas temperature. The calculation technique we proposed will enable the qualitative examination of the structure of DPF with catalyst addition, which can be useful for the optimization design of DPF.

    DOI: 10.11351/jsaeronbun.52.257

    CiNii Article

  3. Mercury Dust Monitor (MDM) Onboard the Mio Orbiter of the BepiColombo Mission

    Kobayashi Masanori, Shibata Hiromi, Nogami Ken'ichi, Fujii Masayuki, Hasegawa Sunao, Hirabayashi Masatoshi, Hirai Takayuki, Iwai Takeo, Kimura Hiroshi, Miyachi Takashi, Nakamura Maki, Ohashi Hideo, Sasaki Sho, Takechi Seiji, Yano Hajime, Krueger Harald, Lohse Ann-Kathrin, Srama Ralf, Strub Peter, Grun Eberhard

    SPACE SCIENCE REVIEWS   Vol. 216 ( 8 )   2020.12

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s11214-020-00775-7

    Web of Science

  4. Acoustic signal production in ethanol by energetic xenon ions Reviewed

    Kobayashi Masanori, Miyachi Takashi, Okudaira Osamu, Takechi Seiji, Kurozumi Atsuma, Uno Takefumi, Nakamura Maki, Shibata Hiromi, Okada Nagaya, Fujii Masayuki, Murakami Takeshi, Uchihori Yukio

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 59 ( 2 ) page: .   2020.2

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  5. Soot-combustion catalyst of Pd/ZrO2 composites prepared from Zr65Pd35 amorphous alloy by oxidation treatment Reviewed

    Masakuni Ozawa, Atsuhiko Masuda, Maki Nakamura, Masatomo Hattori, Hidemi Kato, Shin-ichi Yamamura

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 59 ( SA )   2020.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    Metal-dispersed Pd/ZrO2 composites were derived from amorphous Zr65Pd35 alloy and their catalytic behavior for diesel soot combustion was studied. X-ray diffractograms and scanning electron micrographs indicated that mixtures of ZrO2 phase and the dispersed metallic phase were formed in the resulting material after heat treatment at 800 degrees C in air. The oxidized alloy resulted in the enhanced soot combustion activity. The removal property of catalyst, evaluated as temperature, is almost 100 degrees C better than that in the non-catalyzed reaction. The combustion processes were observed by in situ high temperature optical microscopy (HTOM) and ex situ electron microscopy with different scales. The secondary soot particle started the combustion at the primary soot near catalyst. Upon heating to higher temperature between 570 degrees C and 590 degrees C the soot layer rapidly disappeared in in situ HTOM, while both the black band and dispersed part of soot on a alumina substrate remained without combustion even kept at 650 degrees C. Therefore, soot did not move with micron-order distance and its combustion process should depend on their contact points of catalyst surfaces and soot aggregate. This work provided a new type of catalytic material prepared from amorphous alloys which was effective soot combustion catalysis. (c) 2019 The Japan Society of Applied Physics

    DOI: 10.7567/1347-4065/ab45fb

    Web of Science

    Scopus

  6. Numerical Calculation of PM Trapping and Oxidation of Diesel Particulate Filter with Catalyst Reviewed

    Maki Nakamura, Koji Yokota, Masatomo Hattori and Masakuni Ozawa

    SAE Technical paper     page: 2020-01-2169   2020

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  7. PM Trapping and Oxidation in Diesel Particulate Filter with Catalyst by Numerical Calculation of One-dimensional Model Reviewed

    Nakamura Maki, Yokota Koji, Ozawa Masakuni

    Transactions of Society of Automotive Engineers of Japan   Vol. 51 ( 2 ) page: 238 - 243   2020

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Society of Automotive Engineers of Japan  

    In this study, we proposed a numerical method to estimate the behavior of PM distribution in DPF both in PM-deposition and regeneration process. In the result, we found that PM oxidation was occasionally incomplete and partially remained in the DPF even if the PM deposition-regeneration process was repeated in the DPF. In such case, the phenomenon that the oxygen supply slightly decreased towards the rear part of the DPF was found, so that the remained PM in the DPF induced the new PM deposition. By using a novel model, PM deposition distribution and modeling of the oxidization reaction, where deposition-regeneration is especially repeated within DPF, could be performed and time-dependent behavior of pressure loss was considered. The present modeling will make possible suggest the required timing which performs compulsive reproduction control of DPF.

    DOI: 10.11351/jsaeronbun.51.238

    CiNii Article

  8. Numerical Calculation of PM Trapping and Oxidation of Diesel Particulate Filter – Thermal Analysis in the DPF (Second Report) Reviewed

    Nakamura Maki, Yokota Koji, Hattori Masatomo, Ozawa Masakuni

    Transactions of Society of Automotive Engineers of Japan   Vol. 51 ( 2 ) page: 274 - 279   2020

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Society of Automotive Engineers of Japan  

    The particulate matter (PM) discharged from the diesel engine is collected by a diesel particulate filter (DPF) and then removed. Deterioration of fuel consumption is a serious problem since exhaust gas temperature must be increased when PM removal is performed. In this study, the numerical computation for both the behavior of PM distribution in the DPF during PM deposition-regeneration process and the heat distribution in the DPF was performed. The temperature-distribution and its change in DPF as a function of the time during PM combustion were calculated by a newly developed model. It was concluded that the amount of increasing temperature change was far larger backside in direction than that near the entrance of an inflow way. The present model can be used for optimal designing of DPF with a catalyst by assuming several operation modes of DPF device before an experimental approach.

    DOI: 10.11351/jsaeronbun.51.274

    CiNii Article

  9. 1次元モデルによる触媒付ディーゼル微粒子フィルターのPM堆積・酸化シ ミュレーション-DPF形状依存性(第三報) Reviewed

    横田幸治, 中村真季, 小澤正邦

    自動車技術会論文集   Vol. 51 ( 5 ) page: 882 - 887   2020

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  10. Phenomena of PM deposition and oxidation in the diesel particulate filter Reviewed

    Maki Nakamura, Masakuni Ozawa

    SAE Technical paper     2019

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

  11. Effect of Surface Cavity Shape on PM Deposition and Pressure Drop in DPF Porous Material Reviewed

    NAKAMURA Maki, OZAWA Masakuni

    Journal of the Society of Materials Science, Japan   Vol. 67 ( 5 ) page: 562 - 567   2018

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Society of Materials Science, Japan  

    <p>The diesel particulate filter (DPF) has attracted strong attention as a desirable after-treatment device for the particulate matter(PM) contained in exhaust gas of diesel engine. When particulate matter was deposited on a DPF, the pressure drop increases due to the PM trapping in the surface cavities of the DPF. In this study, we compared the dependence of the shape and depth of the pore of the DPF on the PM trapping process by total model and numerical calculation. We found that the pressure drop and elapsed time of the PM trapping varied, significantly depending on the pore shape of the DPF surface. Further we examined the relative importance of the amount of PM deposit and the surface cavity shape of the DPF, and found that the pressure drop was lower when the shape of surface cavity in DPF became flatter and shallower. The result provides a quantitative evaluation and design of the surface cavity in the DPF leading to better production process of porous ceramic parts. </p>

    DOI: 10.2472/jsms.67.562

    Scopus

    CiNii Article

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  12. Development of in-situ micro-debris measurement system Reviewed

    Nakamura M.

    Advances in Space Research   Vol. 56 ( 3 ) page: 436 - 448   2015.8

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    Publishing type:Research paper (scientific journal)   Publisher:Advances in Space Research  

    DOI: 10.1016/j.asr.2015.04.009

    Scopus

  13. Numerical Simulation of Trapping Process in Hexagonal Diesel Particulate Filters Reviewed

    Nakamura Maki, Hanamura Katsunori, Shibuta Takumi, Yoshino Hajime, Iwasaki Kentaro

    Transactions of Society of Automotive Engineers of Japan   Vol. 46 ( 2 ) page: 313 - 317   2015.3

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Society of Automotive Engineers of Japan  

    The process of soot trapping in a hexagonal cell geometry diesel particulate filters (HEX DPF) in surface pores filtration made of aluminum titanium oxide were investigated through a simple analysis based on Darcy's law through the wall and deposited soot layer. In this study, we focused on the trapping process of the HEX DPF cell in surface pores filtration by Numerical Simulation. The HEX DPF had two types of flow: one was a flow through a wall between inlet and outlet channels (inlet/outlet wall flow), and the other was a flow which was introduced into a wall between inlet and inlet channels, and was turned toward the direction parallel to the wall, and finally exited into the outlet channel (bypass flow). As a result, the process of soot trapping in surface pores filtration was shown by numerical simulation. It was possible to express the transition process from surface pores filtration to cake filtration.

    DOI: 10.11351/jsaeronbun.46.313

    CiNii Article

    CiNii Books

  14. Flow Analysis during Soot Trapping on Aluminum Titanate Ceramics Filter with Hexagonal Cell Geometry Reviewed

    Maki NAKAMURA, Katsunori Hanamura, Takumi Shibuta, Kentaro Iwasaki, Hajime Yoshino

    International Journal of Automotive Engineering (IJAE)   Vol. 6 ( 1 ) page: 31-37   2015

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    The phenomena of soot trapping and oxidation in a hexagonal cell geometry DPF made of aluminum titanium oxide were investigated through microscopic visualization experiment and a simple analysis based on Darcy's law through the wall and the deposited soot layer. There were two types of flow: one was a flow through a wall between inlet and outlet channels (inlet/outlet wall flow), and the other was a flow which was introduced into a wall between inlet and inlet channels, and was turned toward the direction parallel to the wall, and finally exited into the outlet channel (bypass flow). The flow rate of the bypass flow was increased with a thickness of soot layer deposited on the inlet/outlet wall. As a result, the soot was trapped even on the inlet/inlet wall surface. In the regeneration process, depending on the flow rate of the bypass flow, the maximum temperature for the hexagonal cell DPF became lower compared with that for the conventional DPF.

    DOI: https://doi.org/10.20485/jsaeijae.6.1_31

  15. Flow Analysis during Soot Trapping on Aluminum Titanate Ceramics Filter with Hexagonal Cell Geometry Reviewed

    Maki NAKAMURA, Katsunori Hanamura, Takumi Shibuta, Kentaro Iwasaki, Hajime Yoshino

    International Journal of Automotive Engineering (IJAE)   Vol. 6 ( 1 ) page: 31-37   2015

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

    The phenomena of soot trapping and oxidation in a hexagonal cell geometry DPF made of aluminum titanium oxide were investigated through microscopic visualization experiment and a simple analysis based on Darcy's law through the wall and the deposited soot layer. There were two types of flow: one was a flow through a wall between inlet and outlet channels (inlet/outlet wall flow), and the other was a flow which was introduced into a wall between inlet and inlet channels, and was turned toward the direction parallel to the wall, and finally exited into the outlet channel (bypass flow). The flow rate of the bypass flow was increased with a thickness of soot layer deposited on the inlet/outlet wall. As a result, the soot was trapped even on the inlet/inlet wall surface. In the regeneration process, depending on the flow rate of the bypass flow, the maximum temperature for the hexagonal cell DPF became lower compared with that for the conventional DPF.

  16. Variation in resonant frequency of piezoelectric lead-zirconate-titanate element undergoing high-level radiation Reviewed

    Masanori Kobayashi, Takashi Miyachi, Seiji Takechi, Tomoaki Mitsuhashi, Yoshinori Miura, Hiromi Shibata, Nagaya Okada, Maki Hattori, Osamu Okudaira, Masayuki Fujii, Takeshi Murakami, Yukio Uchihori

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 53 ( 6 )   2014.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    A piezoelectric lead-zirconate-titanate (PZT) element was exposed to a 400MeV/n xenon beam and the radiation effect on the element was studied as a variation of resonant and antiresonant frequencies by the resonance method. A possible effect of heating the element on the resonant frequency was avoided by using data obtained while the temperature of the element was kept constant. Consequently, the variation of the resonant frequency was empirically represented by a simple function of the amount of accumulated energy in the element. We therefore discuss the piezoelectric PZT element as a potential detector for high-level radiation. We point out that a piezoelectric equation including the heat term is required to explain the experimental results. (C) 2014 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.53.066602

    Web of Science

  17. Output characteristics of piezoelectric lead zirconate titanate detector using high-energy heavy-ion beam Reviewed

    Seiji Takechi, Masahiro Sekiguchi, Takashi Miyachi, Masanori Kobayashi, Maki Hattori, Osamu Okudaira, Hiromi Shibata, Masayuki Fujii, Nagaya Okada, Takeshi Murakami, Yukio Uchihori

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 737   page: 52 - 55   2014.2

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

    A radiation detector fabricated using piezoelectric lead zirconate titanate (PZT) has been studied by irradiating it with a 400 MeV/n xenon (Xe) beam. The beam diameter was controlled to change the irradiation conditions. It was found that the magnitude of the output observed from the PZT detector may be related to the number of Xe ions per unit area per unit time within the limits of the experimental conditions. (C) 2013 Elsevier B.V. All rights reserved

    DOI: 10.1016/j.nima.2013.11.029

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  18. Study of Deterioration in a Piezoelectric Lead Zirconate Titanate Radiation Detector through Measurement of the Electromechanical Coupling Factor with 400 MeV/n Zenon Ions Reviewed

    Masanori Kobayashi, Takashi Miyachi, Seiji Takechi, Masahiro Sekiguchi, Hiromi Shibata, Nagaya Okada, Maki Hattori, Osamu Okudaira, Masayuki Fujii, Takeshi Murakami, Yukio Uchihori

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 52 ( 12 )   2013.12

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    The variation of the electromechanical coupling factor (ECF) was measured by bombarding a piezoelectric lead zirconate titanate (PZT) element with 400 MeV/n xenon ions. The element was exposed to energies up to 10(4) J, during which time the ECF was observed by the resonance method. The ECF gradually decreased with the energy accumulated during irradiation, and its behavior was scaled with an empirical formula. This decrease suggests that the piezoelectric quality deteriorated; hence, the sensitivity of the PZT radiation detector was considered to be degraded as well. The variation ultimately originated in resonance-associated processes. A potential detector suitable for use in severe-radiation environments was discussed. (C) 2013 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.52.126604

    Web of Science

  19. Influence of a Polyimide Surface Layer on the Piezoelectric Response of Lead-Zirconate-Titanate Cosmic Dust Detector Reviewed

    Maki Hattori, Masanori Kobayashi, Takashi Miyachi, Seiji Takechi, Osamu Okudaira, Takeo Iwai, Nagaya Okada, Seiji Sugita

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 52 ( 2 )   2013.2

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    The influence of a thermal reflector on the sensitivity of a lead-zirconate-titanate element is studied by bombarding the element with hypervelocity microparticles. The reflector is a 60-mu m-thick layer made of polyimide resin that coats the surface of the element. By applying the fast Fourier transform method to data analysis, impact information is obtained through the fundamental resonant component. As a result, the sensitivity of the element is considerably reduced by the reflector. In addition, it is found that the sensitivity is substantially position-independent. (C) 2013 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.52.028002

    Web of Science

  20. Position-Dependent Behavior of Piezoelectric Lead-Zirconate-Titanate Cosmic Dust Detector Reviewed

    Maki Hattori, Masanori Kobayashi, Takashi Miyachi, Seiji Takechi, Osamu Okudaira, Takeo Iwai, Seiji Sugita

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 51 ( 9 )   2012.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN SOC APPLIED PHYSICS  

    A possible position dependence of the signal amplitudes generated by a piezoelectric lead-zirconate-titanate (PZT) detector was studied by bombarding the PZT element with hypervelocity microparticles. The detector was equipped with a set of asymmetrically arranged electrodes. The characteristic features of the element were analyzed using the amplitudes of the fundamental resonant component caused by collisions. As a result, the sensitivity of the element measured with direct collisions onto the collector was found to be one order of magnitude greater than that in the external area of the collector. (C) 2012 The Japan Society of Applied Physics

    DOI: 10.1143/JJAP.51.098004

    Web of Science

  21. A future observational plan of dust particles around the Moon by LDM (Lunar Dust Monitor) onboard the orbiter of the next Japanese lunar mission

    Kobayashi Masanori, Ohashi Hideo, Sasaki Sho, SHIBATA Hiromi, IWAI Takeo, FUJII Masayuki, NOGAMI Ken-ichi, KIMURA Hiroshi, NAKAMURA Maki H., HIRAI Takayuki, SRAMA Ralf, GRUN Eberhard

    Earth, planets and space   Vol. 63 ( 10 ) page: 1113-1117   2011.10

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

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  22. A future observational plan of dust particles around the Moon by LDM (Lunar Dust Monitor) onboard the orbiter of the next Japanese lunar mission

    Kobayashi Masanori, Ohashi Hideo, Sasaki Sho, SHIBATA Hiromi, IWAI Takeo, FUJII Masayuki, NOGAMI Ken-ichi, KIMURA Hiroshi, NAKAMURA Maki H, HIRAI Takayuki, SRAMA Ralf, GRUN Eberhard

    Earth, planets and space   Vol. 63 ( 10 ) page: 1113-1117   2011.10

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MISC 3

  1. Microparticle detection with piezoelectric sensor in space exploration

      ( 15 ) page: 163 - 168   2015

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    Language:Japanese  

    CiNii Article

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  2. Hypervelocity Microparticle Detection Using Piezoelectric PZT for Cosmic Dust Observation

    KOBAYASHI Masanori, MIYACHI Takashi, NAKAMURA Maki H., SUGITA Seiji, IWAI Takeo, TAKECHI Seiji

      Vol. 2011 ( 19 ) page: 43 - 48   2011.6

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    Language:Japanese  

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  3. Effects of a light reflecting layer to the response of PZT elements

    NAKAMURA Maki H., KOBAYASHI Masanori, MIYACHI Takashi, TAKECHI Seiji, IWAI Takeo, SUGITA Seiji, OKUDAIRA Osamu, SRAMA Ralf

      Vol. 2011 ( 19 ) page: 49 - 52   2011.6

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Presentations 4

  1. 1次元モデルによる触媒付きディーゼル微粒子フィルターのPM堆積・酸化シミュレーション-触媒によるPM燃焼挙動の解析(第四報) International coauthorship

    中村真季

    自動車技術会 秋季大会学術講演会  2020.10.23  自動車技術会

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    Event date: 2020.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:online  

  2. Numerical Calculation of PM Trapping and Oxidation of Diesel Particulate Filter with Catalyst International conference

    Maki Nakamura, Koji Yokota, Masatomo Hattori and Ozawa Masakuni

    SAE/ Powertrains, Fuels and Lubricants  2020.9.22  SAE

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    Event date: 2020.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Digital summit  

  3. 1次元モデルによる触媒付ディーゼル微粒子フィルターのPM堆積・酸化シミュレーション-DPF形状依存性(第3報)

    中村真季

    自動車技術会 春季大会学術講演会  2020.5  自動車技術会

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    Language:Japanese   Presentation type:Oral presentation (general)  

  4. Phenomena of PM deposition and oxidation in the diesel particulate filter International conference

    Maki Nakamura and Ozawa Masakuni

    SAE/ Powertrains, Fuels and Lubricants  2019.8.27  SAE

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    Event date: 2019.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Kyoto  

KAKENHI (Grants-in-Aid for Scientific Research) 11

  1. ディーゼル微粒子フィルターへのPM堆積と低温酸化(ミクロ–マクロ)の研究

    2020.4

    科学研究費補助金  基盤研究(C)

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    Authorship:Principal investigator 

  2. ディーゼル微粒子フィルターへのPM堆積と低温酸化(ミクロ-マクロ)の研究

    Grant number:20K04325  2020.4 - 2023.3

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    中村 真季

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    Authorship:Principal investigator 

    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

    反応科学超高圧走査透過電子顕微鏡および走査型電子顕微鏡を用いたPMの酸化反応機構の原子レベルの可視化とデジタルマイクロスコープを実機レベルの可視化を行い,固体燃料(PM)・固体触媒・気相の三相界面におけるPM酸化反応評価方法の確立を行う.また,PM堆積および燃焼現象のメカニズムを数値計算にて解明しDPF全体のPM堆積燃焼のモデルを構築する.さらに実験結果を用いて上記のモデルを補完し,DPF全体におけるPM堆積と酸化反応のモデル化を行う.以上の研究を通じたDPFの構造最適化により,300℃台の低温排ガスによるPMの触媒酸化を実現し,PM堆積時の圧力損失と再生時の燃料悪化を大幅に低減させる.

  3. ディーゼル微粒子フィルターへのPM堆積と低温酸化(ミクロ–マクロ)の研究

    2020.4

    日本学術振興会  科学研究費助成事業  基盤研究(C)

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    Authorship:Other  Grant type:Competitive

  4. 触媒付フィルターによるディーゼル自動車排ガス中粒子状物質の捕集と低温除去の研究

    Grant number:18J40246  2018.4 - 2021.3

    日本学術振興会  科学研究費助成事業 特別研究員奨励費  特別研究員奨励費

    中村 真季

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    Authorship:Other 

    PM堆積メカニズムのモデル化およびPMと触媒の反応(数値計算モデル構築).
    DPF内のPM堆積・再生過程の実際はDPFの構造上可視化が難しいという現状を考慮し,これらの変化を数値計算により明らかにすることを試みた.DPF内でPM分布等の関係について,触媒付DPFを想定したフィルター内でのPM付着と再生過程を定量的に予測することはこれまで検討されていない.とくに一連の繰り返し堆積―再生過程でDPF内のPM分布とその変化を観測することはDPF設計手法において現状では不十分であると考えられる.すなわち,本研究はDPF内に堆積するPMの堆積・強制再生のモデル化と条件最適化をめざした検討を行った.とくに,DPF内でPMの堆積-酸化浄化を繰返す場合で,流入口と流出口からPM堆積分布や酸化挙動のモデル化を行い,入出口の圧力の差や全体圧損の時間変化を検討し,強制再生を行うタイミングを示唆することを目的とし,PM堆積-再生過程におけるDPF内のPM分布の挙動を推定するための数値計算手法を提案した.このモデルを用いて以下三つの結果を得た.
    1) PM堆積・酸化シミュレーション -PM分布に関する研究(第1報)-(学会発表1件、論文発表1報)
    2) PM堆積・酸化シミュレーション -DPF内熱解析に関する研究(第2報)-(学会発表1件、論文発表1報)
    3) PM堆積・酸化シミュレーション -DPF形状依存性 (第3報)-(学会発表1件、論文投稿中)
    本研究で検討した計算手法を用いれば,DPFの形状を変化させた上で定性的に検討をすることが可能となり,DPFの最適設計化に役立てることができる.
    翌年度、交付申請を辞退するため、記入しない。
    翌年度、交付申請を辞退するため、記入しない。

  5. 触媒付フィルターによるディーゼル自動車排ガス中粒子状物質の捕集と低温酸化

    2018.4 - 2020.3

    科学研究費補助金 

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    Authorship:Principal investigator 

  6. 触媒付フィルターによるディーゼル自動車排ガス中粒子状物質の捕集と低温酸化

    2018.4 - 2020.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

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    Authorship:Other  Grant type:Competitive

  7. Active soot collection and low-temperature oxidation in situ measurement by bypass flow in honeycomb channel filter wall

    Grant number:16K18027  2016.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)  Grant-in-Aid for Young Scientists (B)

    NAKAMURA Maki

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

    The diesel particulate filter (DPF) has attracted strong attention as a desirable after-treatment device for the particulate matter (PM) contained in exhaust gas of diesel engine. After that, an active regeneration is required. Since more fuel is required for the regeneration in addition to the normal driving (passive regeneration), the fuel economy deteriorates. In order to improve the performance, a passive regeneration is necessary. In this study, we compared the dependence of the shape and depth of the cavity of the DPF on the PM trapping process by a comprehensive overall model and numerical calculation. Based on the above result, we simulated a combination of hydrodynamics and oxidation reaction during PM deposition and combustion. Through this simulation, we constructed a series of models from PM deposition to combustion process. The result provides a quantitative evaluation and design of the surface cavity in the DPF leading to better production process of porous ceramic parts.

  8. ハニカム流路フィルター壁内バイパス流による能動的スス捕集と低温酸化その場計測

    2016.4 - 2018.3

    科学研究費補助金  若手研究(B)

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    Authorship:Principal investigator 

  9. ハニカム流路フィルター壁内バイパス流による能動的スス捕集と低温酸化その場計測

    2016.4 - 2018.3

    日本学術振興会  科学研究費助成事業  若手研究(B)

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    Authorship:Principal investigator  Grant type:Competitive

  10. シリカ被服ナノ粒子貴金属触媒に接するススの三相界面反応の原子レベル可視化

    2014.4 - 2016.3

    科学研究費補助金  若手研究(B)

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    Authorship:Principal investigator 

  11. Atomic level visualization of the three-phase interface reaction of soot with the silica coating nanoparticles noble metal catalyst

    Grant number:26820060  2014.4 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)  Grant-in-Aid for Young Scientists (B)

    Nakamura Maki

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\4030000 ( Direct Cost: \3100000 、 Indirect Cost:\930000 )

    The phenomena of soot trapping and oxidation in a hexagonal cell geometry DPF made of aluminum titanium oxide were investigated through microscopic visualization experiment and a simple analysis. The flow rate of the bypass flow was increased with a thickness of soot layer deposited on the inlet/outlet wall. As a result, the soot was trapped even on the inlet/inlet wall surface. In the regeneration process, depending on the flow rate of the bypass flow, the maximum temperature for the hexagonal cell DPF became lower compared with that for the conventional DPF.
    Soot oxidation on nano-sized SiC-particles covered by an oxide layer with or without Pt was investigated using a temperature programmed reactor. From the results of CB oxidation experiments at constant temperature, the apparent activation energy of CB oxidation on the surface of SiC nano-particle was about 140kJ/mol which was almost fixed in any case of oxygen concentration and case of with or w/o Pt.

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