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Mizutani, K.,Niiyama, M.,Nakano, T.,Yosoi, M.,Nozawa, Y.,Ahn, D. S.,Ahn, J. K.,Chang, W. C.,Chen, J. Y.,Daté,, S.,Gohn, W.,Hamano, H.,Hashimoto, T.,Hicks, K.,Hiraiwa, T.,Hotta, T.,Hwang, S. H.,I American Physical Society 2017 Physical Review C Vol.96 No.6
<P>Differential cross sections at t = t(min) and decay asymmetries for the gamma p -> phi p reaction have been measured using linearly polarized photons in the range 1.5 to 2.9 GeV. These cross sections were used to determine the Pomeron strength factor. The cross sections and decay asymmetries are consistently described by the t-channel Pomeron and pseudoscalar exchange model in the E-gamma region above 2.37 GeV. In the lower energy region, an excess over the model prediction is observed in the energy dependence of the differential cross sections at t = t(min). This observation suggests that additional processes or interference effects between Pomeron exchange and other processes appear near the threshold region.</P>
Study on the surface pressure distribution of cubes in cross-wind arrays
Lim, H.-C.,Tsukamoto, K.,Ohba, M.,Mizutani, K. Elsevier Scientific Pub. Co 2014 Journal of wind engineering and industrial aerodyn Vol.133 No.-
In this study, effects of the gap on equal-spaced cubical bodies (150mmx150mmx150mm) placed in a turbulent boundary layer were investigated inside an atmospheric boundary layer wind tunnel. This study includes various measurements of surface-pressure distribution around a building in close proximity to surrounding obstacles. In addition, we examined the surface-pressure variation with cube distances (G) at 75mm (0.5h), 150mm (1h), 225mm (1.5h) and ~ (i.e., a single cube). The experiments conducted included some boundary layer wind tunnel tests with Hot Wire Anemometry (HWA) and mean and fluctuating surface-pressure measurements around a set of cubes aligned in parallel. The tunnel tests were carried out at two different Reynolds numbers (Re=4.6x10<SUP>4</SUP> and 6.7x10<SUP>4</SUP>), based on wind velocity U<SUB>h</SUB> (4.5m/s and 7.3m/s) at a cube height h. On analyzing the results, we discovered that the gap effect of surrounding models has a significant influence on the pressure variation around the central model. The overall surface-pressure coefficient around the central structure was generally found to increase as the gap (G) between the structures was increased.
Carrier Lifetime Reduction in a p-i GaAs/AlGaAs Asymmetric Triple Quantum Well Structure
K. Mizutani,H. S. Ahn,M. Yamaguchi,N. Sawaki,Y. Nishimoto 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
The lifetime of photo-excited carriers in a p-i GaAs/AlGaAs asymmetric triple quantum well structure was investigated by the femto-second pump-probe method. The transmission change of the probe pulse shows the decay of the carriers excited by the pump pulse in the ATQW. The carrier relaxation time was as short as 80 ps in the weak pump beam intensity region. The fast decay is attributed to the hole tunneling in the valence band.
Laser 유기 압력 Pulse법에 의한 전력 케이블중의 공간전하 분포에 관한 연구
한상옥,김종석,이덕출,M.Mizutani 한국전기전자재료학회 1993 電氣電子材料學會誌 Vol.6 No.4
레이저 유기 압력 펄스법을 이용하여 가교폴리에틸렌필름과 전력케이블의 공간전하의 성질을 정량적으로 연구하여 다음과 같은 결론을 얻었다. 잔류가교제를 갖는 XLPE에서는 음극으로부터 현저한 전자주입이 나타나고 시료전체에 걸쳐 부의 공간 전하가 형성되었으며 음극으로 부터의 전자 주입은 전계상승에 따라 증가 하였다. XLPE 전력 케이블에서는 잔류가교제가 이온화하여 생긴 정 및 부의 헤테로 공간 전하가 음극 및 양극 부근에 형성되었다.