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Journal of Materials Science and Chemical Engineering 2017年第1期5卷 42-47页

作者： Hiroki Nakaie tetsuji arai Chiaya Yamamoto Keisuke Arimoto Junji Yamanaka Kiyokazu Nakagawa Toshiyuki Takamatsu Interdisciplinary Graduate School of Medicine and Engineering University of Yamanashi Kofu Japan SST Inc. Yachiyo Japan

We have developed a microwave plasma heating technique to rapidly heat the transition metal. W/SiO2 layers were deposited on Ge/Si heterostructures. By heating the W, dislocations in Ge layers originated from lattice mismatch between Ge and Si crystals were reduced drastically. We have fabricated p- MOSFETs on Ge/Si substrates and realized higher mobility of about 380 cm2/ Vs than that of Si p-MOSFET.

关键词： Microwave Plasma Heating High Hole Mobility Ge on Si

Formation of Poly-Si Films on Glass Substrates by Using Microwave Plasma Heating and Fabrication of TFT’s on the Films

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Journal of Materials Science and Chemical Engineering 2018年第1期6卷 19-24页

作者： Hiroki Nakaie tetsuji arai Keisuke Arimoto Junji Yamanaka Kiyokazu Nakagawa Kazuki Kamimura Toshiyuki Takamatsu Interdisciplinary Graduate School of Medicine and Engineering University of Yamanashi Kofu Japan SST Inc. Yachiyo Japan

We have developed an apparatus for producing high-density hydrogen plasma. The atomic hydrogen density was 3.0 × 1021 m?3 at a pressure of 30 Pa, a microwave power of 1000 W, and a hydrogen gas flow rate of 5 sccm. We confirmed that the temperatures of tungsten films increased to above 1000?C within 5 s when they were exposed to hydrogen plasma formed using the apparatus. We applied this phenomenon to the selective heat treatment of tungsten films deposited on amorphous silicon films on glass substrates and formed polycrystalline silicon films. To utilize this method, we can perform the crystalline process only on device regions. TFTs were fabricated on the polycrystalline silicon films and the electron mobilities of 60 cm2/Vs were obtained.

关键词： Microwave Plasma Heating Poly-Si Thin Film Transistor

STEM MoiréObservation of Lattice-Relaxed Germanium Grown on Silicon

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Journal of Materials Science and Chemical Engineering 2017年第1期5卷 102-108页

作者： Junji Yamanaka Chiaya Yamamoto Hiroki Nakaie tetsuji arai Keisuke Arimoto Kosuke O. Hara Kiyokazu Nakagawa Center for Crystal Science and Technology University of Yamanashi Kofu Japan Center for Creative Technology University of Yamanashi Kofu Japan Center for Instrumental Analysis University of Yamanashi Kofu Japan

We deposited Ge films on Si substrates by molecular beam epitaxy (MBE) method. The specimens were annealed at around 750 C using microwave- plasma heating technique which we had reported before. After these pro- cesses, we carried out special scanning transmission electron microscopic (STEM) observation. The moiré between the crystal lattices and the scanning lines controlled by STEM was utilized to show lattice-spacing distribution. The results exhibited that we were succeeded in forming lattice-relaxed Ge thin films. It was also recognized that this STEM moiré technique is very useful to observe lattice-spacing distribution for large area with high resolution.

关键词： STEM Moiré Lattice Strain Ge on Si Plasma Heating

Exploring the novel role of oligodendrocyte precursor cells in phagocytosis:beyond myelinogenesis

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Neural Regeneration Research 2025年第2期20卷 473-474页

作者： Gen Hamanaka Ken arai Neuroprotection Research Laboratories Departments of Radiology and NeurologyMassachusetts General Hospital and Harvard Medical SchoolCharlestownMAUSA

Roles of oligodendrocyte precursor cells in the central nervous system:Oligodendrocyte precursor cells(OPCs)have long been recognized for their critical role as precursors to oligodendrocytes,the primary myelin-producing *** precursors,OPCs mature and differentiate into oligodendrocytes,which contribute significantly to the formation of myelin sheaths around *** myelination,which is critical for the conduction of salutatory nerve impulses in the cerebral white matter,underscores the classical role of oligodendrocytes in central nervous system(CNS)***,because oligodendrocytes are differentiated cells that cannot proliferate.

关键词： critical system conduction

Ohmic Contact Formation for n+4H-SiC Substrate by Selective Heating Method Using Hydrogen Radical Irradiation

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Journal of Materials Science and Chemical Engineering 2017年第1期5卷 35-41页

作者： tetsuji arai Kazuki Kamimura Chiaya Yamamoto Mai Shirakura Keisuke Arimoto Junji Yamanaka Kiyokazu Nakagawa Toshiyuki Takamatsu Masaaki Ogino Masaaki Tachioka Haruo Nakazawa Interdisciplinary Graduate School of Medicine and Engineering University of Yamanashi Kofu Japan SST Inc. Yachiyo Japan Fuji Electric Co. Ltd. Matsumoto Japan

We developed an apparatus for producing high-density hydrogen plasma. We confirmed that the temperatures of transition-metal films increased to above 800?C within 5 s when they were exposed to hydrogen plasma formed using the apparatus. We applied this phenomenon to the selective heat treatment of W/Ni films deposited on n+4H-SiC wafers and formed nickel silicide electrodes. To utilize this method, we can perform the nickel silicidation process without heating the other areas such as channel regions and improve the reliability.

关键词： Selective Heating Nickel Silicide Electrode Hydrogen Plasma Ohmic Contact SiC

Selective Heating of Transition Metal Usings Hydrogen Plasma and Its Application to Formation of Nickel Silicide Electrodes for Silicon Ultralarge-Scale Integration Devices

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Journal of Materials Science and Chemical Engineering 2016年第1期4卷 29-33页

作者： tetsuji arai Hiroki Nakaie Kazuki Kamimura Hiroyuki Nakamura Satoshi Ariizumi Satoki Ashizawa Keisuke Arimoto Junji Yamanaka Tetsuya Sato Kiyokazu Nakagawa Toshiyuki Takamatsu Interdisciplinary Graduate School of Medicine and Engineering University of Yamanashi Kofu Japan SST Inc. Yachiyo Japan

We developed an apparatus for producing high-density hydrogen plasma. The atomic hydrogen density was 3.1 × 1021 m?3 at a pressure of 30 Pa, a microwave power of 1000 W, and a hydrogen gas flow rate of 10 sccm. We confirmed that the temperatures of transition-metal films increased to above 800。C within 5 s when they were exposed to hydrogen plasma formed using the apparatus. We applied this phenomenon to the selective heat treatment of nickel films deposited on silicon wafers and formed nickel silicide electrodes. We found that this heat phenomenon automatically stopped after the nickel slicidation reaction finished. To utilize this method, we can perform the nickel silicidation process without heating the other areas such as channel regions and improve the reliability of silicon ultralarge-scale integration devices.

关键词： Selective Heating Nickel Silicide Electrode Hydrogen Plasma Microwave Plasma

Inelastic constitutive equation of plasma-sprayed ceramic thermal barrier coatings

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Acta Metallurgica Sinica(English Letters) 2011年第2期24卷 161-168页

作者： Masayuki arai Materials Science Research Laboratory Central Research Institute of Electric Power Industry

Ceramic thermal barrier coatings （TBCs） are a very important technology for protecting the hot parts of gas turbines （GTs） from a high-temperature environment. The coating stress generated in the operation of GTs brings cracking and peeling damage to the TBCs. Thus, it is necessary to evaluate precisely such coating stress in a TBC system. We have obtained a stress-strain curve for a freestanding ceramic coat specimen peeled from a TBC coated substrate by conducting the bending test. The test results have revealed that the ceramic coating deforms nonlinearly with the applied loading. In this study, an inelastic constitutive equation for the ceramic thermal barrier coatings deposited by APS is developed. The obtained results are as follows：（1） the micromechanics-based constitutive equation was formulated with micro crack density formed at splat boundary, and （2） it was shown that the numerical results for a nonlinearly deformed beam simulated by the developed constitutive equation agreed with the experimental results obtained by cantilever bending tests.

关键词： Inelastic constitutive equation Thermal barrier coating Gas turbine Micromechanics

How to Transmit Disaster Information Effectively:A Linguistic Perspective on Japan’s Tsunami Warnings and Evacuation Instructions

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International Journal of Disaster Risk Science 2013年第3期4卷 150-158页

作者： Kyoko arai Faculty of Business Administration Toyo UniversityTokyo 112-8606Japan

When the disastrous tsunamis hit East Japan on 11 March 2011, the hi-tech information transmission system that is the pride of Japan was unable to send out the Tsunami Warnings effectively;many lives were lost as a result. Subsequently, the Japan Meteorological Agency(JMA) set up a committee of experts to improve the overall system. Last year as a result of their meetings, a report on The Improvement of the Information Text for the Tsunami Warnings was announced. The changes are, however, problematic from the linguistics perspective as the committee did not include any experts in the field. This study examines a range of recordings of the Tsunami Warnings and the Evacuation Instructionsi given for the East Japan tsunami disaster from the perspective of linguistics, especially pragmatics, whose main objective is to discover how recipients interpret verbal messages. The aim of this article is to propose further improvement to the transmission system of Tsunami Warnings and Evacuation Instructions. This study also emphasizes the necessity and importance of reexamining the overall disaster information transmission issue in Japan, from the linguistics perspective.

关键词： disaster Japan recording

Detection of small delamination in mullite/Si/SiC model EBC system by pulse thermography

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Journal of Advanced Ceramics 2019年第3期8卷 438-447页

作者： Yutaro arai Ryo INOUE Department of Materials Science and Technology Tokyo University of Science6-3-1NiijyukuKatsushika-kuTokyo125-8585Japan Department of Mechanical Engineering Tokyo University of Science6-3-1NiijyukuKatsushika-kuTokyo125-8585Japan

The pulse thermography(PT) technique was applied to the detection of the delamination of a multi-layered coating system composed of mullite/Si onto a reaction-bonded Si C substrate. The potential evaluation was carried out in order to detect internal delamination in multi-layered material system. Moreover, the observation of the cross sections and 3D views obtained by X-ray computed tomography(CT) indicated that the delamination occurred at the interface between the top coat and the bond coat layers. The changes in the temperature distribution obtained by PT indicated the existence of a delamination area in the top coat layer of the mullite. In particular, the lower temperature region corresponded to the delamination area. The experimental results confirmed that the PT technique is effective with respect to the internal delamination of multi-layered coating system.

关键词： environmental barrier coatings (EBCs) delamination pulse thermography (PT) multi-layer image processing

Formation of anorthosite on the Moon through magma ocean fractional crystallization

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Geoscience Frontiers 2017年第2期8卷 299-308页

作者： Tatsuyuki arai Shigenori Maruyama Department of Earth and Planetary Sciences Tokyo Institute of Technology2-12-10okayamaMeguro-kuTokyo 152-8551Japan Earth-Life Science Institute Tokyo Institute of Technology2-12-1 OokayamaMeguro-kuTokyo 152-8551Japan

Lunar anorthosite is a major rock of the lunar highlands,which formed as a result of plagioclasefloatation in the lunar magma ocean（LMO）.Constraints on the sufficient conditions that resulted in the formation of a thick pure anorthosite（mode of plagioclase 〉95 vol.%） is a key to reveal the early magmatic evolution of the terrestrial *** form the pure lunar anorthosite,plagioclase should have separated from the magma ocean with low crystal *** networks of plagioclase and mafic minerals develop when the crystal fraction in the magma（φ） is higher than ca.40-60 vol.%,which inhibit the formation of pure *** contrast,when φ is small,the magma ocean is highly turbulent,and plagioclase is likely to become entrained in the turbulent magma rather than separated from the *** determine the necessary conditions in which anorthosite forms from the LMO,this study adopted the energy criterion formulated by *** composition of melt,temperature,and pressure when plagioclase crystallizes are constrained by using MELTS/pMELTS to calculate the density and viscosity of the *** plagioclase starts to crystallize,the Mg~# of melt becomes 0.59 at 1291 *** density of the melt is smaller than that of plagioclase for P 〉 2.1 kbar（ca.50 km deep）,and the critical diameter of plagioclase to separate from the melt becomes larger than the typical crystal diameter of plagioclase（1.8-3 cm）.This suggests that plagioclase is likely entrained in the LMO just after the plagioclase starts to *** the Mg~# of melt becomes 0.54 at 1263 C,the density of melt becomes larger than that of plagioclase even for 0 *** the Mg~# of melt decreases down to 0.46 at 1218 C,the critical diameter of plagioclase to separate from the melt becomes 1.5-2.5 cm,which is nearly equal to the typical plagioclase of the lunar *** suggests that plagioclase could separate from the *** of the differences between the Earth and the Moon is the presenc

关键词： Moon Anorthosite Magma ocean MELTS Fractional crystallization