We analyze shear-horizontal vibrations of a functionally graded piezoelectric plate of polarized ceramics or crystals of 6mm symmetry.The material of the central portion of the plate is different from that of the rest...We analyze shear-horizontal vibrations of a functionally graded piezoelectric plate of polarized ceramics or crystals of 6mm symmetry.The material of the central portion of the plate is different from that of the rest of the plate.It is shown that when the material properties of the central portion and the rest of the plate satisfy certain conditions,there exist trapped thicknessshear and thickness-twist modes whose vibrations are mainly confined within the central portion and decay quickly outside the central portion.The effects of the functionally graded material properties on the behaviors of the trapped modes are examined.展开更多
The dissociative chemisorption of N_(2) is the rate-limiting step for ammonia synthesis in industry.Here,we investigated the role of initially vibrational excitation and ro-tational excitation of N_(2) for its reactiv...The dissociative chemisorption of N_(2) is the rate-limiting step for ammonia synthesis in industry.Here,we investigated the role of initially vibrational excitation and ro-tational excitation of N_(2) for its reactivity on the Fe(111)surface,based on a recently developed six-dimensional potential energy surface.Six-dimensional quantum dynamics study was carried out to investi-gate the effect of vibrational excitation for incidence energy below 1.6 eV,due to sig-nificant quantum effects for this reaction.The effects of vibrational and rotational excitations at high incidence energies were revealed by quasiclassical trajectory calculations.We found that raising the translational energy can enhance the dissociation probability to some extent,however,the vibrational excitation or rotational excitation can promote disso-ciation more efficiently than the same amount of translational energy.This study provides valuable insight into the mode-specific dynamics of this heavy diatom-surface reaction.展开更多
基金supported by the National Natural Science Foundation of China (No. 10972147)the Program for Changjiang Scholars and Innovative Research Team in University (No. IRT0971)
文摘We analyze shear-horizontal vibrations of a functionally graded piezoelectric plate of polarized ceramics or crystals of 6mm symmetry.The material of the central portion of the plate is different from that of the rest of the plate.It is shown that when the material properties of the central portion and the rest of the plate satisfy certain conditions,there exist trapped thicknessshear and thickness-twist modes whose vibrations are mainly confined within the central portion and decay quickly outside the central portion.The effects of the functionally graded material properties on the behaviors of the trapped modes are examined.
基金supported by the National Key R&D Program of China(No.2018YFE0203003)the National Natural Science Foundation of China(No.22173099 and No.22173101)the Liaoning Revitalization Talents Program(No.XLYC1907190)。
文摘The dissociative chemisorption of N_(2) is the rate-limiting step for ammonia synthesis in industry.Here,we investigated the role of initially vibrational excitation and ro-tational excitation of N_(2) for its reactivity on the Fe(111)surface,based on a recently developed six-dimensional potential energy surface.Six-dimensional quantum dynamics study was carried out to investi-gate the effect of vibrational excitation for incidence energy below 1.6 eV,due to sig-nificant quantum effects for this reaction.The effects of vibrational and rotational excitations at high incidence energies were revealed by quasiclassical trajectory calculations.We found that raising the translational energy can enhance the dissociation probability to some extent,however,the vibrational excitation or rotational excitation can promote disso-ciation more efficiently than the same amount of translational energy.This study provides valuable insight into the mode-specific dynamics of this heavy diatom-surface reaction.
