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RISS 인기검색어
- 검색키워드
- 저자 : Takehiko SATO (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Characteristics of Breakdown Voltage at a Narrow Gap in a Non-thermal Plasma Flow
Takehiko SATO,Hideya Nishiyama,Makoto Kambe 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
Characteristics of breakdown voltage in a non-thermal plasma flow at atmospheric pressure were investigated %%@ experimentally. Breakdown voltages for different gap lengths of parallel plate electrodes were measured with %%@ respect to applied voltage rising rate, applied waveform, applied wave frequency, gas flow rate and kind of gas. %%@ The correlation between $pd$, which is the product of the pressure and the gap length, and breakdown voltage %%@ corresponded to Penning's experimental data of the applied voltage rising rates from 0.1 kV/s to 10 kV/s. However, %%@ the correlation was not in accordance with Penning's data when rising rates were greater than 100 kV/s. The %%@ breakdown voltages showed a minimum value when gas flow rates were 2 - 4 Sl/min for both argon and nitrogen gases. %%@ On the other hand, the correlation between breakdown voltage and $pd$ corresponded to the experimental data %%@ reported by Penning, Kind and Karner concerning the cases of sawtooth wave, sinusoidal wave and square wave with %%@ different wave frequencies of 100 Hz, 1 kHz and 10 kHz. Discharge current mode is classified into two modes and it %%@ was influenced by gas flow rate.
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HUGE DIRECT NUMERICAL SIMULATION OF TURBULENT COMBUSTION
Mamoru Tanahashi,Takehiko Seo,Makoto Sato,Akihiko Tsunemi,Toshio Miyauchi 한국전산유체공학회 2008 한국전산유체공학회지 Vol.13 No.4
Current state and perspective of DNS of turbulence and turbulent combustion are discussed with feature trend of the fastest supercomputer in the world. Based on the perspective of DNS of turbulent combustion, possibility of perfect simulations of IC engine is shown. In 2020, the perfect simulation will be realized with 30 billion grid points by 1 EXAFlops supercomputer, which requires 4 months CPU time. The CPU time will be reduced to about 4 days if several developments were achieved in the current fundamental researches. To shorten CPU time required for DNS of turbulent combustion, two numerical methods are introduced to full-explicit full-compressible DNS code. One is compact finite difference filter to reduce spatial resolution requirements and numerical oscillations in small scales, and another is well-known point-implicit scheme to avoid quite small time integration of the order of nanosecond for fully explicit DNS. A vailability and accuracy of these numerical methods have been confirmed carefully for auto-ignition, planar laminar flame and turbulent premixed flames. To realize DNS of IC engine with realistic kinetic mechanism, several DNS of elemental combustion process in IC engines has been conducted.
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HUGE DIRECT NUMERICAL SIMULATION OF TURBULENT COMBUSTION - TOWARD PERFECT SIMULATION OF IC ENGINE -
Tanahashi, Mamoru,Seo, Takehiko,Sato, Makoto,Tsunemi, Akihiko,Miyauchi, Toshio Korea Society of Computational Fluids Engineering 2008 한국전산유체공학회지 Vol.13 No.4
Current state and perspective of DNS of turbulence and turbulent combustion are discussed with feature trend of the fastest supercomputer in the world. Based on the perspective of DNS of turbulent combustion, possibility of perfect simulations of IC engine is shown. In 2020, the perfect simulation will be realized with 30 billion grid points by 1EXAFlops supercomputer, which requires 4 months CPU time. The CPU time will be reduced to about 4 days if several developments were achieved in the current fundamental researches. To shorten CPU time required for DNS of turbulent combustion, two numerical methods are introduced to full-explicit full-compressible DNS code. One is compact finite difference filter to reduce spatial resolution requirements and numerical oscillations in small scales, and another is well-known point-implicit scheme to avoid quite small time integration of the order of nanosecond for fully explicit DNS. Availability and accuracy of these numerical methods have been confirmed carefully for auto-ignition, planar laminar flame and turbulent premixed flames. To realize DNS of IC engine with realistic kinetic mechanism, several DNS of elemental combustion process in IC engines has been conducted.
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Hydrogen plasma treatment for improving bulk passivation quality of c-Si solar cells
Suttirat Rattanapan,Hiroshi Yamamoto,Shinsuke Miyajima,Takehiko Sato,Makoto Konagai 한국물리학회 2010 Current Applied Physics Vol.10 No.2
We have investigated the effects of radio frequency hydrogen plasma (H-plasma) treatment on bulk passivation qualities of cast poly-crystalline silicon (poly c-Si) wafers. When the hydrogen treatment was performed directly to poly c-Si wafers, the plasma damage was introduced and it was difficult to improve the minority carrier lifetime by optimizing the plasma condition. Hydrogenated amorphous silicon oxide (a-SiOx:H) films deposited by RF-PECVD using a mixture of SiH4, H2 and CO2 were employed as the protection and the passivation layers. We found that the lifetime of poly c-Si substrates passivated by a RFPECVD a-SiOx:H films with additional H-plasma treatment showed an improvement of the overall effective lifetime. Annealing up to 400 ℃ also enhances the further diffusion of hydrogen, and the effective lifetime of the samples with H-plasma treatment increased 20–30% compared to the samples without treatment. This result clearly indicated that the H-plasma treatment improves the bulk passivation quality of poly c-Si wafers.
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