The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Gen Ito - One of the best experts on this subject based on the ideXlab platform.
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Incident Angle dependence of reflected particles in low energy xenon ion impacts on metal surfaces
Computational Materials Science, 2021Co-Authors: Gen Ito, Rei Kawashima, Kimiya Komurasaki, Hiroyuki KoizumiAbstract:Abstract Ion-wall reflection characteristics are of great importance in the design of ground test facilities for electric propulsion because these characteristics determine the rarefied flow conditions inside the vacuum chambers. In this study, the reflection characteristics of 300 eV xenon Incident on aluminum and titanium metal targets were calculated by molecular dynamics (MD) simulations. The resultant characteristics show the angular dependence of the reflected particles. The trajectories of the reflected particles show that the dominant reflection mechanism is different depending on the Incident Angle. A practical model that can be used to reproduce the calculated reflection characteristics is presented. Three parameters required for the model are obtained by fitting the model to the MD calculation results of the polar probability and energy distributions of the reflected xenon particles. The three-dimensional distributions reproduced by applying the three parameters to the model show good agreement with the MD simulation results.
Ming-huei Yu - One of the best experts on this subject based on the ideXlab platform.
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Effects of laser beam energy and Incident Angle on the pulse laser welding of stainless steel thin sheet
Journal of Materials Processing Technology, 2007Co-Authors: Yi-chun Liao, Ming-huei YuAbstract:Abstract This paper reports an experimental study of laser spot welding on stainless steel sheets. A pulsed Nd:YAG laser was used to weld the stainless steel specimen in the range of laser energy 0.6–1.2 J and Incident Angle 30–75° (the Angle of the laser beam Incident direction to the sheet surface). Metallography was applied to measure the cross-sectional size and shape of the welded spot. From the experimental results, it is found that as the laser energy increases, the penetration depth, bead length, and bead width of the welded spot increase. As the laser Incident Angle increases, the penetration depth and the bead width increase while the bead length decreases. The results illustrate that the shape and size of the welded spot depend not only on the laser energy, but also on the Incident Angle of laser beam.
Hiroyuki Koizumi - One of the best experts on this subject based on the ideXlab platform.
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Incident Angle dependence of reflected particles in low energy xenon ion impacts on metal surfaces
Computational Materials Science, 2021Co-Authors: Gen Ito, Rei Kawashima, Kimiya Komurasaki, Hiroyuki KoizumiAbstract:Abstract Ion-wall reflection characteristics are of great importance in the design of ground test facilities for electric propulsion because these characteristics determine the rarefied flow conditions inside the vacuum chambers. In this study, the reflection characteristics of 300 eV xenon Incident on aluminum and titanium metal targets were calculated by molecular dynamics (MD) simulations. The resultant characteristics show the angular dependence of the reflected particles. The trajectories of the reflected particles show that the dominant reflection mechanism is different depending on the Incident Angle. A practical model that can be used to reproduce the calculated reflection characteristics is presented. Three parameters required for the model are obtained by fitting the model to the MD calculation results of the polar probability and energy distributions of the reflected xenon particles. The three-dimensional distributions reproduced by applying the three parameters to the model show good agreement with the MD simulation results.
Yi-chun Liao - One of the best experts on this subject based on the ideXlab platform.
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Effects of laser beam energy and Incident Angle on the pulse laser welding of stainless steel thin sheet
Journal of Materials Processing Technology, 2007Co-Authors: Yi-chun Liao, Ming-huei YuAbstract:Abstract This paper reports an experimental study of laser spot welding on stainless steel sheets. A pulsed Nd:YAG laser was used to weld the stainless steel specimen in the range of laser energy 0.6–1.2 J and Incident Angle 30–75° (the Angle of the laser beam Incident direction to the sheet surface). Metallography was applied to measure the cross-sectional size and shape of the welded spot. From the experimental results, it is found that as the laser energy increases, the penetration depth, bead length, and bead width of the welded spot increase. As the laser Incident Angle increases, the penetration depth and the bead width increase while the bead length decreases. The results illustrate that the shape and size of the welded spot depend not only on the laser energy, but also on the Incident Angle of laser beam.
Zhenyue Guo - One of the best experts on this subject based on the ideXlab platform.
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wideband metamaterial array with polarization independent and wide Incident Angle for harvesting ambient electromagnetic energy and wireless power transfer
Applied Physics Letters, 2017Co-Authors: Huiteng Zhong, Xuexia Yang, Xingtang Song, Zhenyue GuoAbstract:In this work, we introduced the design, demonstration, and discussion of a wideband metamaterial array with polarization-independent and wide-Angle for harvesting ambient electromagnetic (EM) energy and wireless power transfer. The array consists of unit cells with one square ring and four metal bars. In comparison to the published metamaterial arrays for harvesting EM energy or wireless transfer, this design had the wide operation bandwidth with the HPBW (Half Power Band Width) of 110% (6.2 GHz–21.4 GHz), which overcomes the narrow-band operation induced by the resonance characteristic of the metamaterial. On the normal incidence, the simulated maximum harvesting efficiency was 96% and the HPBW was 110% for the random polarization wave. As the Incident Angle increases to 45°, the maximum efficiency remained higher than 88% and the HPBW remained higher than 83% for the random polarization wave. Furthermore, the experimental verification of the designed metamaterial array was conducted, and the measured re...
