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418 results on '"Fujioka, Tomoo"'

4. Analysis of cross-flow jet-type singlet oxygen generator

Author

Watanabe, Goro, Sugimoto, Daichi, Tei, Kazuyoku, and Fujioka, Tomoo

Subjects
Gas lasers -- Optical properties, Gas lasers -- Electric properties, Oxygen equipment (Medical care) -- Product development, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A cross-flow jet type singlet oxygen generator is developed, tested and analyzed in order to characterize the dependence of output performance on major input parameters. Details of the analysis are provided and the results of the study will be useful for upgrading the existing models.

Published
2004

7. Parametric study of a twisted aerosol-type singlet oxygen generator

Author

Wani, Fumio, Endo, Masamori, Vyskubenko, Boris A., Ilyin, Sergey P., Krukovsky, Ivan M., Takeda, Shuzaburo, and Fujioka, Tomoo

Subjects
Chemical lasers -- Analysis, Gas lasers -- Analysis, Quantum electronics -- Research, Aerosols -- Usage, Active oxygen -- Usage, Pulse generators -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A new twisted aerosol singlet oxygen generator (TA-SOG) was created for supersonic chemical oxygen-iodine laser. The new TA-SOG can be operated at an internal gas velocity of 85 m/s. Such operational ability is three times higher than that of the jet-type SOG. A deviation was noted between predicted results and experimental results which can be attributed to the macroscopic mass transfer of H2O ions and the rise of the real specific surface.

Published
1998

8. Output power stabilization of a chemical oxygen-iodine laser with an external magnetic field

Author

Sugimoto, Daichi, Endo, Masamori, Nanri, Kenzo, Shyuzaburo, Takeda, and Fujioka, Tomoo

Subjects
Magnetic fields -- Research, Gas lasers -- Research, Power supply (Electronics) -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

Feedback control system was constructed, in which the intensity of the magnetic field applied to the laser medium varied automatically in response to the laser power fluctuation, and used to demonstrate the output power stabilization for a chemical oxygen-iodine laser. A theoretical analysis of the input/output characteristics of the feedback system was performed and was observed to be in agreement with experimental results. The response time of the system was also found to be as short as 1 ms limited by the applied voltage of the electromagnet.

Published
1998

9. Performance characteristics of narrow linewidth fiber laser pumped mid-IR difference frequency mixing light source for methane detection

Author

Ashizawa, Hiroaki, Ohara, Shinobu, Yamaguchi, Shigeru, Takahashi, Masao, Endo, Masamori, Nanri, Kenzo, Fujioka, Tomoo, and Tittel, Frank K

Subjects
Life Sciences (General)
Abstract

A high-power, narrow-linewidth Yb fiber laser with a fiber Bragg grating (FBG) pumped difference frequency generation (DFG) in a periodically poled lithium niobate (PPLN) crystal was investigated in detail. A mid-IR power of approximately 2.3 microW at 3.3 micrometers with a slope efficiency of 0.85 mW/W2 was achieved. A Doppler-broadened absorption spectrum of CH4 at 3038.497 cm-1 (3.2911 micrometers) was obtained with a 0.1-m long-gas cell at a pressure of 133 Pa. The linewidth of the DFG source was evaluated to be less than 96 MHz from the observed spectral linewidth. Real-time monitoring of CH4 (approximately 1.78 ppm) in ambient air in a multipass cell which has an optical path length of 10 m was also demonstrated.

Published
2003
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10. TCT-344 Impact of OCT-Guided PCI Using a Specific Stent Optimization Strategy on Clinical Outcomes in Comparison Between Patients With and Without Diabetes Mellitus

Author

Kuroda, Masaru, primary, Kawata, Masahito, additional, Matsuura, Akira, additional, Adachi, Kazumasa, additional, Hirayama, Yasutaka, additional, Matsuura, Takeshi, additional, Noda, Tsubasa, additional, Kodaira, Mutsuki, additional, Kintsu, Masayuki, additional, Suzuki, Yuya, additional, Miyazaki, Yuichiro, additional, and Fujioka, Tomoo, additional

Published
2019
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11. Modeling of crossflow jet-type singlet oxygen generator.

Author

Watanabe, Goro, Sugimoto, Daichi, Vyskubenko, Oleg, Tei, Kazuyoku, Nanri, Kenzo, and Fujioka, Tomoo

Subjects
EUCLID'S elements, REACTIVE oxygen species, IONIZATION of gases, INDUSTRIAL use of oxygen, PLANE geometry, FREE radicals, RADICALS (Chemistry)
Abstract

A quasi-two-dimensional model has been developed to predict the performance of a crossflow jet singlet oxygen generator. The model takes into account HO2- depletion, gas temperature variation due to the pooling deactivation of O2(1Δ), and the stretch effect of gas/liquid interaction area due to the jet-induced pressure loss. The modeling results compare favorably with the test data measured over a wide range of geometries and operation conditions. The overall agreements between measured and calculated values in terms of root-mean-square errors for utilization, yield, and gas temperature are 0.030, 0.035, and 16.23 K, respectively. [ABSTRACT FROM AUTHOR]

Published
2005
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15. Effect of SF6 fluorine donor on the multikilojoule HF chemical laser initiated longitudinally by intense electron beams.

Author

Fujioka, Tomoo, Kannari, Fumihiko, Suzuki, Tadashi, and Obara, Minoru

Subjects
*FLUORINE, *CHEMICAL lasers, *HYDROGEN fluoride
Abstract

Presents a study that investigated the effects of fluorine donor additives and initiation level on hydrogen fluoride chemical lasers. Methodology; Analysis of the output characteristics of the laser; Measurement of the laser energy.

Published
1985
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16. Improved performance of a closed-cycle self-sustained discharge-excited cw CO laser.

Author

Sato, Shun-ichi, Kiyota, Mamoru, Fujioka, Tomoo, and Saito, Hideaki

Subjects
CARBON monoxide lasers, CARRIER waves
Abstract

Presents a study that described the performance characteristics of a closed-cycle subsonic carrier wave carbon monoxide laser. Methodology; Evaluation of the discharge characteristics of the laser; Examination of the output performance of the laser.

Published
1985
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17. An advanced kinetic model of electron-beam-excited KrF lasers including the vibrational relaxation in KrF*(B) and collisional mixing of KrF*(B,C).

Author

Kannari, Fumihiko, Obara, Minoru, and Fujioka, Tomoo

Subjects
LASERS, KRYPTON, DYNAMICS
Abstract

Describes a kinetic model of electron-beam-excited krypton fluoride (KrF) lasers which puts into consideration the vibrational relaxation process. Reason for the decrease in efficiency of KrF lasers; List of KrF kinetic rate constants used in the model; Information on previous models of Krf lasers.

Published
1985
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34. History of COIL Development in Japan: 1982-2002

Author

TOKAI UNIV HIRATSUKA (JAPAN) DEPT OF PHYSICS, Endo, Masamori, Uchiyama, Taro, Nanri, Kenzo, Takeda, Shuzaburo, Fujioka, Tomoo, TOKAI UNIV HIRATSUKA (JAPAN) DEPT OF PHYSICS, Endo, Masamori, Uchiyama, Taro, Nanri, Kenzo, Takeda, Shuzaburo, and Fujioka, Tomoo

Abstract

A twenty-years of COIL researches and developments in Japan are reviewed. The researches of four major sites, namely, Keio University, Industrial Research Institute, Kawasaki Heavy Industries and Tokai University are presented in order of time. Epoch-making works are highlighted, and the significance of those works in the industrial COIL development is discussed. Finally, current status of COIL researches in Japan is introduced., This article is from the Proceedings of SPIE v4631, p116-127, 2002. Prepared in cooperation with the Dept. of System Design Engineering, Keio Univ. Yokohama, Japan. This article is from ADA403173 Gas and Chemical Lasers and Intense Beam Applications III Held in San Jose, CA, USA on 22-24 January 2002

Published
2002

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