Faculty Profiles - NAKAMURA Maki

Papers - NAKAMURA Maki

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

Maki Nakamura, Masakuni Ozawa

SAE Technical paper 2019

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

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 Books

Development of in-situ micro-debris measurement system Reviewed

Nakamura M.

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

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

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 Books

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

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

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

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

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

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

Web of Science

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

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

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

Dust detector using piezoelectric lead zirconate titanate with current-to-voltage converting amplifier for functional advancement Reviewed

Kobayashi, Masanori ; Miyachi, Takashi ; Hattori, Maki ; Sugita, Seiji ; Takechi, Seiji ; Okada, Nagaya

Earth, Planets and Space 2013.3

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

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

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

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

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

Laboratory experiments on crater scaling-law for sedimentary rocks in the strength regime Reviewed

22) Suzuki, A., S. Hakura, T. Hamura, M. Hattori, R. Hayama, T. Ikeda, H. Kusuno, H. Kuwahara, Y. Muto, K. Nagaki, R. Niimi, Y. Ogata, T. Okamoto, T. Sasamori, C. Sekigawa, T. Yoshihara, S. Hasegawa, K. Kurosawa, T. Kadono, A. M. Nakamura, S. Sugita, and M. Arakawa

2012.8

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

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

Kobayashi, M; Ohashi, H; Sasaki, S; Shibata, H; Iwai, T; Fujii, M; Nogami, K; Kimura, H; Nakamura, MH; Hirai, T; Srama, R; Grün, E

EARTH PLANETS AND SPACE Vol. 63 ( 10 ) page： 1113 - 1117 2011

Effect of Heating and Cooling on the Piezoelectric Properties of a PZT Sensor for Mercury Dust Monitor Reviewed

24) Takeo IWAI, Maki NAKAMURA, Hideo OHASHI, Hiromi SHIBATA, Takashi MIYACHI, Seiji TAKECHI, Hajime YANO, Sho SASAKI, Masayuki FUJII, Ken-ichi NOGAMI, Eberhard GRÜN and Ralf SRAMA

Trans. JSASS Aerospace Tech. Japan 2010

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Papers - NAKAMURA Maki