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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.
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.