Mitsuru Abe

Kyoto University

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Co-Authors

Jon Paul Lundquist

University of Nova Gorica

T. Nonaka

The University of Tokyo

K. Kadota

Tokyo City University

F. Kakimoto

Kanagawa University

D. R. Bergman

University of Utah

O. Kalashev

Institute for Nuclear Research

Rasha Abbasi

Loyola University Chicago

E. Kido

Astrobiology Center

T. Suzawa

Saitama University

N. Hayashida

Kanagawa University

Cooperative Institutions

Consejo Nacional de Investigaciones Científicas y Técnicas

485

University of Buenos Aires

346

Universidad Nacional de La Plata

330

Instituto de Tecnologías en Detección y Astropartículas

268

Pierre Auger Observatory

258

Institute of Astronomy and Space Physics

256

University of Alaska Anchorage

241

Clark Atlanta University

237

Providence College

224

National University of General San Martín

223

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Proactive Control Method Based on System Margin in Evolutional Agent System

2012 IEEE/WIC/ACM International Conferences on Web Intelligence and Intelligent Agent Technology (2012)

Akiko Takahashi Mitsuru Abe Wenpeng Wei Tetsuo Kinoshita

We propose a new method for controlling multiagent systems proactively considering the "control possibility" and "control effect" for reducing the decrement of QoS to the absolute minimum while providing service in a service-provisioning system based on multiagent system. Moreover, we implement a multimedia communication system based on the proposed method to evaluate its effectiveness. Results from comparison with a conventional multimedia communication system show that the system can provide adequate multimedia communication services.

Provisioning

Margin (machine learning)

10.1109/wi-iat.2012.201

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Citations (3)

Search for point sources of ultra-high-energy photons with the Telescope Array surface detector

Monthly Notices of the Royal Astronomical Society (2019)

Rasha Abbasi Mitsuru Abe T. Abu‐Zayyad M. Allen R. Azuma

The surface detector (SD) of the Telescope Array (TA) experiment allows one to indirectly detect photons with energies of order $10^{18}$ eV and higher and to separate photons from the cosmic-ray background. In this paper we present the results of a blind search for point sources of ultra-high energy (UHE) photons in the Northern sky using the TA SD data. The photon-induced extensive air showers (EAS) are separated from the hadron-induced EAS background by means of a multivariate classifier based upon 16 parameters that characterize the air shower events. No significant evidence for the photon point sources is found. The upper limits are set on the flux of photons from each particular direction in the sky within the TA field of view, according to the experiment's angular resolution for photons. Average 95% C.L. upper limits for the point-source flux of photons with energies greater than $10^{18}$, $10^{18.5}$, $10^{19}$, $10^{19.5}$ and $10^{20}$ eV are $0.094$, $0.029$, $0.010$, $0.0073$ and $0.0058$ km$^{-2}$yr$^{-1}$ respectively. For the energies higher than $10^{18.5}$ eV, the photon point-source limits are set for the first time. Numerical results for each given direction in each energy range are provided as a supplement to this paper.

Air shower

Point source

10.1093/mnras/stz3618

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Citations (9)

Biosurfactant Production from Palm Oil Using Sequencing Batch Reactors: Effect of Cycle Time

Advanced materials research (2008)

Onsiri Huayyai Sumaeth Chavadej Ratana Rujiravanit Mitsuru Abe

Production cycle

Sequencing batch reactor

10.4028/www.scientific.net/amr.55-57.861

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Citations (1)

Rapid Benzylation of Cellulose in Tetra-n-butylphosphonium Hydroxide Aqueous Solution at Room Temperature

ACS Sustainable Chemistry & Engineering (2017)

Mitsuru Abe Kazuki Sugimura Yoshiharu Nishiyama Yoshiyuki Nishio

We found a very fast benzylation of cellulose in a tetraalkyl-onium hydroxide solvent system, 47% tetra-n-butylphosphonium hydroxide aqueous solution. Benzyl cellulose (BC) with a degree of substitution (DS) above 2.5 was obtained within 10 min at ambient temperature (20–25 °C) using ∼9 mol equiv of benzyl bromide to the anhydroglucose unit. The highly efficient benzylation proceeded in the transiently stabilized emulsion state of the reaction system, and the product precipitated out as a solid sediment in the liquid medium. At 20 °C, the benzyl DS was 1.92 after 2 min, and reached 2.40 and 2.53 after 5 and 10 min, respectively. The reaction temperature had a negative correlation with the maximum DS in the explored range of 10–50 °C. No significant degradation of the cellulosic main chain was observed for highly substituted BCs (DS > 2.5). The solubility of BC in common organic solvents was also examined for products with various DSs.

Tetra

10.1021/acssuschemeng.7b00492

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Citations (23)

SMILE-3: scientific observation of celestial MeV gamma-rays with electron-tracking Compton telescope

43rd COSPAR Scientific Assembly. Held 28 January - 4 February (2021)

Atsushi Takada H. Kubo Shunsuke Kurosawa T. Tanimori Kenji Hamaguchi

Gamma-Ray Astronomy

Tracking (education)

Celestial sphere

Source

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Development of Convolutional Neural Networks for an Electron-Tracking Compton Camera

Tomonori Ikeda Atsushi Takada Mitsuru Abe Kei Yoshikawa Masaya Tsuda

Electron-tracking Compton camera, which is a complete Compton camera with tracking Compton scattering electron by a gas micro time projection chamber, is expected to open up MeV gamma-ray astronomy. The technical challenge for achieving several degrees of the point spread function is the precise determination of the electron-recoil direction and the scattering position from track images. We attempted to reconstruct these parameters using convolutional neural networks. Two network models were designed to predict the recoil direction and the scattering position. These models marked 41$~$degrees of the angular resolution and 2.1$~$mm of the position resolution for 75$~$keV electron simulation data in Argon-based gas at 2$~$atm pressure. In addition, the point spread function of ETCC was improved to 15$~$degrees from 22$~$degrees for experimental data of 662$~$keV gamma-ray source. These performances greatly surpassed that using the traditional analysis.

Recoil

Tracking (education)

Position (finance)

Electron scattering

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Mass composition of ultrahigh-energy cosmic rays with the Telescope Array Surface Detector data

Physical review. D/Physical review. D. (2019)

Rasha Abbasi Mitsuru Abe T. Abu‐Zayyad M. Allen R. Azuma

The results on ultrahigh-energy cosmic rays (UHECR) mass composition obtained with the Telescope Array surface detector are presented. The analysis employs the Boosted Decision tree (BDT) multivariate analysis built upon 14 observables related to both the properties of the shower front and the lateral distribution function. The multivariate classifier is trained with Monte-Carlo sets of events induced by the primary protons and iron. An average atomic mass of UHECR is presented for energies $1{0}^{18.0}--1{0}^{20.0}\text{ }\text{ }\mathrm{eV}$. The average atomic mass of primary particles shows no significant energy dependence and corresponds to $⟨\mathrm{ln}A⟩=2.0\ifmmode\pm\else\textpm\fi{}0.1(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.44(\mathrm{syst}.)$. The result is compared to the mass composition obtained by the Telescope Array with ${\mathrm{X}}_{\mathrm{max}}$ technique along with the results of other experiments. Possible systematic errors of the method are discussed.

10.1103/physrevd.99.022002

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Citations (48)

Extraction of polysaccharides from bran with phosphonate or phosphinate-derived ionic liquids under short mixing time and low temperature

Green Chemistry (2010)

Mitsuru Abe Yukinobu Fukaya Hiroyuki Ohno

A novel series of 1-alkyl-3-methylimidazolium phosphonate and phosphinate-type ionic liquids is able to extract polysaccharides from bran, which is a renewable biomass. In particular, 1-ethyl-3-methylimidazolium phosphinate is a novel low viscosity polar ionic liquid with which one can extract a series of polysaccharides from bran without heating. The physico-chemical properties of a series of these salts are also determined, in a study of the ability of these ionic liquids to extract cellulose and other polysaccharides from bran.

Phosphinate

Phosphonate

10.1039/c003976d

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Citations (162)

Surface Hydrophobization of Block-Shaped Wood with Rapid Benzylation

Forests (2021)

Mitsuru Abe Masako Seki Tsunehisa Miki Masakazu Nishida

With the aim of utilizing wood as a carbon cycle-oriented material, the improvement of hydrophobicity has been actively studied to solve manufacturing problems, such as dimensional stability and biodeterioration resistance. The introduction of benzyl group is a promising chemical modification for hydrophobizing wood. However, conventional benzylation methods are not suitable for industrial applications because they require high temperature and long reaction times. In this study, a novel method was developed for quickly benzylating the surface of block-shaped wood using an aqueous solution of tetra-n-butylphosphonium hydroxide as a pretreatment solvent and no heat. The color and shape of the benzylated wood was almost unchanged from that before the treatment. Analysis of the resulting chemical structure suggested that the developed method causes less damage to carbohydrates compared with the conventional method, which involves heating and stirring. The proposed method successfully imparted hydrophobicity and thermoplasticity to the benzylated wood surface. Furthermore, hydrophobicity of the benzylated wood was further improved by a simple heat treatment for only approximately 5 min. The water contact angle became ≥110° and remained almost unchanged even after 1 min after water dropping.

Chemical modification

Surface Modification

Heat Resistance

Carbon fibers

10.3390/f12081028

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Citations (1)

Variable-temperature solid-state NMR analysis of woody materials in the presence of small hydroxyl molecules

Journal of Wood Chemistry and Technology (2023)

Masakazu Nishida Mitsuru Abe Masako Seki Tsunehisa Miki Hiroyuki Sugimoto

Interactions between the hierarchical structure of Japanese cypress and small hydroxylic solvents with high polarity were studied using variable-temperature 13C cross-polarization and magic-angle spinning nuclear magnetic resonance (CP/MAS) NMR spectroscopy, including low-temperature measurements. 13C CP/MAS NMR spectra were enhanced by dipolar interactions closely related to 1H–13C magnetization transfer, providing information about the interaction between woody materials and small hydroxyl molecules. The change in interaction was particularly near the melting point of the hydroxylic solvent, where a decrease in the intensity of the cypress carbohydrate signal and the appearance of the signal of solvent molecules were observed. The trend of signal intensity in the variable-temperature 13C CP/MAS NMR spectra of cypress and cellulose fibers in the presence of hydroxylic solvents indicated that the decrease in the carbohydrate signal intensity due to the transfer of magnetization near the melting point of the hydroxyl molecule is greater when the size of the hydroxyl molecule is smaller. Furthermore, molecular association in the nanopores of the hierarchical structure allowed the hydroxyl molecular signals of the impregnated cypress to appear above the melting point.

Magic angle spinning

Cypress

Magnetization transfer

10.1080/02773813.2023.2214131

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