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40 results on '"Yamaguchi Yasuhide"'

1. Improvement of Sinter Productivity and Qualities by Placing Low Slag Green Pellet at Lower Layer of Sinter Packed Bed

Author

Yamaguchi Yasuhide, Kenichi Higuchi, Takayuki Maeda, Taichi Murakami, and Masaru Matsumura

Subjects
Packed bed, Mechanical Engineering, Metallurgy, Metals and Alloys, Slag, Biomass, Condensed Matter Physics, Productivity (ecology), Mechanics of Materials, visual_art, Pellet, visual_art.visual_art_medium, Materials Chemistry, Environmental science, Physical and Theoretical Chemistry, Layer (electronics)
Published
2022

4. Effect of Drying Treatment after Granulating Sinter Raw Materials on Flame Front Speed and Sintering Yield

Author

Yamaguchi Yasuhide, Takazo Kawaguchi, Chikashi Kamijo, Masaru Matsumura, and Masaki Hara

Subjects
010302 applied physics, Yield (engineering), Materials science, Mechanical Engineering, Metallurgy, Metals and Alloys, Sintering, 02 engineering and technology, Raw material, Condensed Matter Physics, 01 natural sciences, 020501 mining & metallurgy, Granulation, 0205 materials engineering, Mechanics of Materials, 0103 physical sciences, Materials Chemistry, Physical and Theoretical Chemistry, Flame front
Published
2017

5. Effect of Adhering Particle and Nuclei Particle Ratio at Separate Granulation Process on the Granule Structure

Author

Seiji Nomura, Kenichi Higuchi, Takazo Kawaguchi, Chikashi Kamijo, Yamaguchi Yasuhide, and Masaru Matsumura

Subjects
010302 applied physics, Chemistry, Granule (cell biology), Metals and Alloys, 02 engineering and technology, Condensed Matter Physics, 01 natural sciences, 020501 mining & metallurgy, Granulation, 0205 materials engineering, 0103 physical sciences, Materials Chemistry, Biophysics, Physical and Theoretical Chemistry
Published
2017

8. Improvement of Sinter Productivity by Adding Return Fine on Raw Materials after Granulation Stage

Author

Youichi Nakagawa, Yamaguchi Yasuhide, Masaki Hara, Chikashi Kamijo, Masaru Matsumura, and Takazo Kawaguchi

Subjects
Materials science, Waste management, business.industry, Mechanical Engineering, Metals and Alloys, engineering.material, Raw material, Condensed Matter Physics, Bulk density, Granulation, Iron ore, Mechanics of Materials, engineering, Materials Chemistry, Environmental science, Stage (hydrology), Physical and Theoretical Chemistry, Process engineering, business, Productivity
Published
2014

10. Technology for Productivity Improvement of Sintering Based on Designing of Composite Granulation and Bed Structure of Sinter Mixture

Author

Takazou Kawaguchi, Chikashi Kamijo, Yamaguchi Yasuhide, Junya Kano, Masahide Yoshikawa, Masaki Hara, and Masaru Matsumura

Subjects
Granulation, Materials science, Mechanics of Materials, business.industry, Mechanical Engineering, Composite number, Metallurgy, Materials Chemistry, Metals and Alloys, Sintering, Process engineering, business, Productivity
Published
2013

33. Study on the Development of Resource-Saving High Performance Slurry - Polishing/CMP for Glass Substrates in a Radical Polishing Environment, Using Manganese Oxide Slurry as an Alternative for Ceria Slurry

Author

Doi, Toshiro K., Yamazaki, Tsutomu, Kurokawa, Syuhei, Umezaki, Yoji, Ohnishi, Osamu, Akagami, Yoichi, Yamaguchi, Yasuhide, and Kishii, Sadahiro

Abstract

While investigating polishing mechanism of glass substrates with ceria abrasives (CeO2), we found its oxidizing properties worked effectively for the polishing. This finding has inspired us to speculate about the possibility of the manganese oxide abrasives as an alternative for ceria as they also have oxidizing properties. Therefore, focusing on the valence of the manganese, we have experimentally manufactured MnO, MnO2, Mn2O3 and Mn3O4 abrasives, and conducted a comparison study of the characteristics obtained with ceria slurry and manganese oxide slurries. As a result, the surface roughness of below Ra 0.8nm obtained with Mn2O3 slurry was found better than that with the conventional ceria slurry, on top of which, its removal rate was as good as or equal to that of ceria. Using a novel, closed type CMP (Chemical Mechanical Polishing) machine, we conducted another glass polishing experiment with ceria and manganese oxide slurries. The inside of the CMP machine was filled with high-pressure gases such as oxygen, air and nitrogen and kept at 500kPa to make the polishing environment radical. Through this experiment, we found an effective polishing method for high-quality surface. The removal rates were several times better than that of the conventional polishing performed in an open CMP machine.

Published
2010
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34. Study on the Development of Resource-Saving High Performance Slurry - Polishing/CMP for Glass Substrates in a Radical Polishing Environment, Using Manganese Oxide Slurry as an Alternative for Ceria Slurry

Author

Doi, Toshiro K., Yamazaki, Tsutomu, Kurokawa, Syuhei, Umezaki, Yoji, Ohnishi, Osamu, Akagami, Yoichi, Yamaguchi, Yasuhide, and Kishii, Sadahiro

Abstract

While investigating polishing mechanism of glass substrates with ceria abrasives (CeO2), we found its oxidizing properties worked effectively for the polishing. This finding has inspired us to speculate about the possibility of the manganese oxide abrasives as an alternative for ceria as they also have oxidizing properties. Therefore, focusing on the valence of the manganese, we have experimentally manufactured MnO, MnO2, Mn2O3 and Mn3O4 abrasives, and conducted a comparison study of the characteristics obtained with ceria slurry and manganese oxide slurries. As a result, the surface roughness of below Ra 0.8nm obtained with Mn2O3 slurry was found better than that with the conventional ceria slurry, on top of which, its removal rate was as good as or equal to that of ceria. Using a novel, closed type CMP (Chemical Mechanical Polishing) machine, we conducted another glass polishing experiment with ceria and manganese oxide slurries. The inside of the CMP machine was filled with high-pressure gases such as oxygen, air and nitrogen and kept at 500kPa to make the polishing environment radical. Through this experiment, we found an effective polishing method for high-quality surface. The removal rates were several times better than that of the conventional polishing performed in an open CMP machine.

Published
2006
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35. Spectroscopic properties of Ti^3+-doped BeAl_2O_4

Author

Sugimoto, Akiko, Yamagishi, Kiyoshi, Anzai, Yutaka, Segawa, Yusaburo, Kim, Pil Hyon, Yamaguchi, Yasuhide, and Namba, Susumu

Abstract

The crystallographic axis dependence of the absorption and photoluminescence spectra of Ti:BeAl_2O_4 is rationalized by assuming that the (3d)1 electron energy levels are split by the cubic and orthorhombic fields present at the Al site in chrysoberyl. The temperature dependence of the luminescence lifetime and integrated intensity indicates that the lifetime shortening that accompanies temperature increase is due to a nonradiative transition with an activation energy estimated to be 1770 cm^−1.

Published
1989

36. Photocatalytic Oxidation of Sulfur on the Doped TiO2Catalysts

Author

Matsumoto, Yasumichi, Yamaguchi, Yasuhide, and Sato, Ei-ichi

Abstract

TiO2(anatase) doped with various elements was used as the photocatalyst in the production of sulfuric acid from sulfur in water into which O2was bubbled. The catalysts doped with typical elements having one and two valencies showed high catalytic activity, but some doped with typical elements having four and five valencies showed low activity. The intermediate, i.e., \dotO2H radical, in the O2reduction produced by photoproduced electrons will probably play an important part in the production of sulfuric acid. Therefore, it was suggested that the Ti3+ion in the TiO2lattice which contribute to direct O2reduction will inhibit sulfuric acid production. In the case of transition metal dopants, the transition metal cation in the TiO2lattice will directly affect the O2reduction. The catalyst doped (deposited) with Pt shows the highest catalytic activity of all the catalysts used in the present study.

Published
1985
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37. Flash Lamp Pumped Tunable Forsterite Laser

Author

Sugimoto, Akiko, primary, Segawa, Yusaburo, additional, Yamaguchi, Yasuhide, additional, Nobe, Yukio, additional, Yamagishi, Kiyoshi, additional, Kim, Pil Hyon, additional, and Namba, Susumu, additional

Published
1989
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40. Optical Properties and Lasing of Ti3+Doped BeAl2O4

Author

Segawa, Yusaburo, Sugimoto, Akiko, Kim, Pit Hyon, Namba, Susumu, Yamagishi, Kiyoshi, Anzai, Yutaka, and Yamaguchi, Yasuhide

Abstract

The absorption and photoluminescence spectra of Ti3+doped chrysoberyl (BeAl2O4) were studied, as well as its lasing operation. The photoluminescence spectrum of Ti:BeAl2O4has two peaks at 750 nm and 850 nm and the lifetime of both these lines is 5.0 µs, which is longer than that of Ti3+doped sapphire (Al2O3). With an excitation power of 15 mJ, lasing wavelength was 803±20 nm and the pulse duration was less than 80 ns.

Published
1987
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