The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
K. Hibino - One of the best experts on this subject based on the ideXlab platform.
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Sidereal daily variation of ∼10 TeV cosmic-ray intensity observed by the Tibet air shower array
Advances in Space Research, 1999Co-Authors: Kazuoki Munakata, T. Hara, S. Yasue, Chihiro Kato, D.l Hall, S. Mori, M. Amenomori, S. Ayabe, L. K. Ding, K. HibinoAbstract:Abstract We analyze the sidereal daily variation of galactic cosmic-ray intensity observed by the Tibet air-shower (AS) array in one year from January to December 1992. The Tibet AS array can detect the Incident Direction of each AS and allows us to examine the daily variations in different declination bands on the celestial sphere. The average hourly AS count is 26,372 and the total observation period is 5,651 hours. We analyze the hourly count rates of AS classified into nine cells according to the Incident Direction of each AS. The hourly count rates are corrected for the atmospheric pressure effect and also for the spurious variation due to the change in the AS size-distribution. We find that the resultant daily variations in sidereal, solar and antisidereal time are influenced by a significant variation (∼0.5%) which is common for the viewing Directions. It is also found that such common variation is well eliminated in the “difference” variations between the eastern and western cells. From the harmonic analysis of the “difference” variations, it is concluded that there is no significant variation observed in one year of data.
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Sidereal daily variation of similar to 10 TeV cosmic-ray intensity observed by the Tibet air shower array
1999Co-Authors: Kazuoki Munakata, T. Hara, S. Yasue, Chihiro Kato, D.l Hall, S. Mori, M. Amenomori, S. Ayabe, L. K. Ding, K. HibinoAbstract:We analyze the sidereal daily variation of galactic cosmic-ray intensity observed by the Tibet air-shower(AS) array in one year from January to December 1992. The Tibet AS array can detect the Incident Direction of each AS and allows us to examine the daily variations in different declination bands on the celestial sphere. The average hourly AS count is 26,372 and the total observation period is 5,651 hours. We analyze the hourly count rates of AS classified into nine cells according to the Incident Direction of each AS. The hourly count rates are corrected for the atmospheric pressure effect and also for the spurious variation due to the change in the AS size-distribution. We find that the resultant daily variations in sidereal, solar and anti-sidereal time are influenced by a significant variation (similar to 0.5%) which is common for the viewing Directions. It is also found that such common variation is well eliminated in the "difference" variations between the eastern and western cells. From the harmonic analysis of the "difference" variations, it is concluded that there is no significant variation observed in one year of data. (C)1999 COSPAR. Published by Elsevier Science Ltd.
Z Song - One of the best experts on this subject based on the ideXlab platform.
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Incident Direction independent wave propagation and uniDirectional lasing
Physical Review Letters, 2018Co-Authors: Z SongAbstract:We propose an Incident Direction free wave propagation generated by uniDirectional destructive interference, which is a consequence of the appropriate match of synthetic magnetic flux and the Incident wave vector. Single-Direction lasing and one-way propagation are feasible without breaking reciprocity or introducing nonlinearity. UniDirectional destructive interference enables a uniDirectional laser and a uniDirectional perfect absorber. When they are combined in a parity-time symmetric manner, the spectral singularities vanish with bounded reflection and transmission. Our findings provide insights into light modulation and will shed light on the exploration of desirable asymmetric features of non-Hermitian systems in fundamental research and practical applications.
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Incident Direction independent wave propagation and uniDirectional lasing
Physical Review Letters, 2018Co-Authors: L Jin, Z SongAbstract:We propose an Incident Direction independent wave propagation generated by properly assembling different uniDirectional destructive interferences (UDIs), which is a consequence of the appropriate match between synthetic magnetic fluxes and the Incident wave vector. Single-Direction lasing at spectral singularity is feasible without introducing nonlinearity. UDI allows uniDirectional lasing and uniDirectional perfect absorption; when they are combined in a parity-time-symmetric manner, the spectral singularities vanish with bounded reflections and transmissions. Furthermore, the simultaneous uniDirectional lasing and perfect absorption for incidences from opposite Directions is created. Our findings provide insights into light control and may shed light on the explorations of desirable functionality in fundamental research and practical applications.
Kazuoki Munakata - One of the best experts on this subject based on the ideXlab platform.
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Sidereal daily variation of ∼10 TeV cosmic-ray intensity observed by the Tibet air shower array
Advances in Space Research, 1999Co-Authors: Kazuoki Munakata, T. Hara, S. Yasue, Chihiro Kato, D.l Hall, S. Mori, M. Amenomori, S. Ayabe, L. K. Ding, K. HibinoAbstract:Abstract We analyze the sidereal daily variation of galactic cosmic-ray intensity observed by the Tibet air-shower (AS) array in one year from January to December 1992. The Tibet AS array can detect the Incident Direction of each AS and allows us to examine the daily variations in different declination bands on the celestial sphere. The average hourly AS count is 26,372 and the total observation period is 5,651 hours. We analyze the hourly count rates of AS classified into nine cells according to the Incident Direction of each AS. The hourly count rates are corrected for the atmospheric pressure effect and also for the spurious variation due to the change in the AS size-distribution. We find that the resultant daily variations in sidereal, solar and antisidereal time are influenced by a significant variation (∼0.5%) which is common for the viewing Directions. It is also found that such common variation is well eliminated in the “difference” variations between the eastern and western cells. From the harmonic analysis of the “difference” variations, it is concluded that there is no significant variation observed in one year of data.
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Sidereal daily variation of similar to 10 TeV cosmic-ray intensity observed by the Tibet air shower array
1999Co-Authors: Kazuoki Munakata, T. Hara, S. Yasue, Chihiro Kato, D.l Hall, S. Mori, M. Amenomori, S. Ayabe, L. K. Ding, K. HibinoAbstract:We analyze the sidereal daily variation of galactic cosmic-ray intensity observed by the Tibet air-shower(AS) array in one year from January to December 1992. The Tibet AS array can detect the Incident Direction of each AS and allows us to examine the daily variations in different declination bands on the celestial sphere. The average hourly AS count is 26,372 and the total observation period is 5,651 hours. We analyze the hourly count rates of AS classified into nine cells according to the Incident Direction of each AS. The hourly count rates are corrected for the atmospheric pressure effect and also for the spurious variation due to the change in the AS size-distribution. We find that the resultant daily variations in sidereal, solar and anti-sidereal time are influenced by a significant variation (similar to 0.5%) which is common for the viewing Directions. It is also found that such common variation is well eliminated in the "difference" variations between the eastern and western cells. From the harmonic analysis of the "difference" variations, it is concluded that there is no significant variation observed in one year of data. (C)1999 COSPAR. Published by Elsevier Science Ltd.
Yuning Guo - One of the best experts on this subject based on the ideXlab platform.
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Effect of oblique force source induced by laser ablation on ultrasonic generation
Optics express, 2014Co-Authors: Yuning Guo, Dexing Yang, Ying Chang, Wei GaoAbstract:The effect of asymmetry caused by oblique line-shaped laser ablation on the generation of ultrasonic waves in metal, especially the effect of transverse component of the ablation force source on the ultrasonic waves is analyzed. Due to the oblique force source, the displacements of shear wave increase obviously by the enhanced shear force, the energy concentration area of longitudinal wave deflects to the small range centered on the Incident Direction while that of shear wave is approximately perpendicular to Incident Direction. In addition, surface wave enhances in the Direction of transverse power flow. Furthermore, some ultrasonic characteristics under vortex laser ablation condition are inferred.
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Simulation of laser-generated longitudinal and shear ultrasonic waves in a diamond anvil cell by the finite element method
Journal of Applied Physics, 2012Co-Authors: Wen Feng, Yuning Guo, Dexing Yang, Xiangchao Zhu, Wei LiaoAbstract:Based on the thermoelastic theory, a numerical model of ultrasonic displacement field induced by a vertical Incident pulsed laser in an aluminum film in a diamond anvil cell (DAC) is established by using the finite element method (FEM). After precisely calculating the transient temperature field distributions, the bulk ultrasonic waveforms on the rear surface of the film and the characteristics of ultrasonic displacement field with time are obtained. Then directivity patterns of laser-generated longitudinal and shear ultrasonic waves are analyzed in details. The numerical results indicate that the thermoelastic force source and the characteristics of ultrasonic directivity are strongly affected by the diamond window. The energy of longitudinal wave is concentrated near the laser Incident Direction, and the one of shear wave is concentrated between 30° and 60° that deflected from the laser Incident Direction to the excited source. These characteristics in DAC system are different from the results of free s...
Jianguo Tian - One of the best experts on this subject based on the ideXlab platform.
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Polarization dependence of graphene transient optical response: interplay between Incident Direction and anisotropic distribution of nonequilibrium carriers
Journal of the Optical Society of America B, 2016Co-Authors: Xiao-qing Yan, Fang Liu, Xiang-tian Kong, Jun Yao, Xin Zhao, Zhi-bo Liu, Jianguo TianAbstract:The transient optical properties of graphene on a dielectric substrate rely on both the Direction of light incidence and anisotropic distribution of excited carriers in graphene. Here, we experimentally and theoretically studied the polarization dependence of transient optical reflection and transmission caused by the interplay between the above two factors. The interplay between the two factors resulted in diverse polarization dependence characteristics and could shift the converting Incident angle for inverse polarization dependence in transient optical response. For large angles of incidence, transient optical transmission exhibited a stronger polarization dependence and no sign reversal, compared with transient optical reflection. Our findings can be useful for designing high-speed photonic devices with controllable transient optical response of graphene.
